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KỲ THI THỬ THPT QUỐC GIA NĂM 2019 MÔN TIẾNG ANH(P9)

Choose the word whose underlined part is pronounced differently from the others

Tiếng Anh Tốt nghiệp THPT
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Kỳ thi thử thpt quốc gia lần 1 năm 2019 môn Tiếng Anh cực hay có lời giải(Đề 4)

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions from 55 to 64.      An air pollutant is defined as a compound added directly or indirectly by humans to the atmosphere in such quantities as to affect humans, animals, vegetation, or materials adversely. Air pollution requires a very flexible definition that permits continuous change. When the first air pollution laws were established inEngland in the fourteenth century, air pollutants were limited to compounds that could be seen or smelled - a far cry from the extensive list of harmful substances known today. As technology has developed and knowledge of the health aspects of various chemicals has increased, the list of air pollutants has lengthened. In the future, even water vapor might be considered an air pollutant under certain conditions.      Many of the more important air pollutants, such as sulfur oxides, carbon monoxide, and nitrogen oxides, are found in nature. As the Earth developed, the concentration of these pollutants was altered by various chemical reactions; they became components in biogeochemical cycles. These serve as an air purification scheme by allowing the compounds to move from the air to the water or soil. On a global basis, nature's output of these compounds dwarfs that resulting from human activities.      However, human production usually occurs in a localized area, such as a city. In such a region, human output may be dominant and may temporarily overload the natural purification scheme of the cycles. The result is an increased concentration of noxious chemicals in the air. The concentrations at which the adverse effects appear will be greater than the concentrations that the pollutants would have in the absence of human activities. The actual concentration need not be large for a substance to be a pollutant; in fact, the numerical value tells us little until we know how much of an increase this represents over the concentration that would occur naturally in the area. For example, sulfur dioxide has detectable health effects at 0.08 parts per million (ppm), which is about 400 times its natural level. Carbon monoxide, however, has a natural level of 0.1 ppm and is not usually a pollutant until its level reaches about 15 ppm.It can be inferred from the first paragraph that _______.

Tiếng Anh Tốt nghiệp THPT
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Kỳ thi thử thpt quốc gia lần 1 năm 2019 môn Tiếng Anh cực hay có lời giải(Đề 4)

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions from 55 to 64.      An air pollutant is defined as a compound added directly or indirectly by humans to the atmosphere in such quantities as to affect humans, animals, vegetation, or materials adversely. Air pollution requires a very flexible definition that permits continuous change. When the first air pollution laws were established inEngland in the fourteenth century, air pollutants were limited to compounds that could be seen or smelled - a far cry from the extensive list of harmful substances known today. As technology has developed and knowledge of the health aspects of various chemicals has increased, the list of air pollutants has lengthened. In the future, even water vapor might be considered an air pollutant under certain conditions.      Many of the more important air pollutants, such as sulfur oxides, carbon monoxide, and nitrogen oxides, are found in nature. As the Earth developed, the concentration of these pollutants was altered by various chemical reactions; they became components in biogeochemical cycles. These serve as an air purification scheme by allowing the compounds to move from the air to the water or soil. On a global basis, nature's output of these compounds dwarfs that resulting from human activities.      However, human production usually occurs in a localized area, such as a city. In such a region, human output may be dominant and may temporarily overload the natural purification scheme of the cycles. The result is an increased concentration of noxious chemicals in the air. The concentrations at which the adverse effects appear will be greater than the concentrations that the pollutants would have in the absence of human activities. The actual concentration need not be large for a substance to be a pollutant; in fact, the numerical value tells us little until we know how much of an increase this represents over the concentration that would occur naturally in the area. For example, sulfur dioxide has detectable health effects at 0.08 parts per million (ppm), which is about 400 times its natural level. Carbon monoxide, however, has a natural level of 0.1 ppm and is not usually a pollutant until its level reaches about 15 ppm.The word "adversely" in the first paragraph is closest in meaning to _______. 

Tiếng Anh Tốt nghiệp THPT
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Tổng hợp đề thi thử mới nhất môn tiếng anh cực hay có lời giải (P9)

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions.By adopting a few simple techniques, parents who read to their children can substantially increase their children’s language development. It’s surprising, but true. How parents talk to their children makes a big difference in the children’s language development. If a parent encourages the child to actively respond to what the parent is reading, the child’s language skills increase.A study was done with 2 to 3 year-old children and their parents. Half of the thirty children participated in the experimental study; the other half acted as the control group. In the experimental group, the parents were given a two-hour training session in which they were taught to ask open-ended questions rather than yes/no questions. For example, the parent should ask, “what is the doggie doing?” rather than, “Is the doggie running away?” Experimental parents were also instructed in how to expand on their children’s answers, how to suggest alternative possibilities, and how to praise correct answers.At the beginning of the study, the children did not differ on measures of language development, but at the end of one month the children in the experimental group tested 5.5 months ahead of the control group on a test of verbal expression and vocabulary. Nine months later, the children in the experimental group still showed an advance of 6 months over the children in the control group.Which of the following words could replace the word adopting in line 1?

Tiếng Anh Tốt nghiệp THPT
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Bài tập thủy phân este đa chức

Cho axit oxalic tác dụng với hỗn hợp 2 ancol đơn chức no đồng đẳng liên tiếp thu được 5,28 gam hỗn hợp 3 este đa chức. Thuỷ phân lượng este trên bằng dung dịch NaOH dư thu được 5,36 gam muối. 2 ancol có công thức là

Hóa học Tốt nghiệp THPT
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Kỳ thi thử thpt quốc gia lần 1 năm 2019 môn Tiếng Anh cực hay có lời giải(Đề 4)

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions from 55to 64.      An air pollutant is defined as a compound added directly or indirectly by humans to the atmosphere in such quantities as to affect humans, animals, vegetation, or materials adversely. Air pollution requires a very flexible definition that permits continuous change. When the first air pollution laws were established inEngland in the fourteenth century, air pollutants were limited to compounds that could be seen or smelled - a far cry from the extensive list of harmful substances known today. As technology has developed and knowledge of the health aspects of various chemicals has increased, the list of air pollutants has lengthened. In the future, even water vapor might be considered an air pollutant under certain conditions.      Many of the more important air pollutants, such as sulfur oxides, carbon monoxide, and nitrogen oxides, are found in nature. As the Earth developed, the concentration of these pollutants was altered by various chemical reactions; they became components in biogeochemical cycles. These serve as an air purification scheme by allowing the compounds to move from the air to the water or soil. On a global basis, nature's output of these compounds dwarfs that resulting from human activities.      However, human production usually occurs in a localized area, such as a city. In such a region, human output may be dominant and may temporarily overload the natural purification scheme of the cycles. The result is an increased concentration of noxious chemicals in the air. The concentrations at which the adverse effects appear will be greater than the concentrations that the pollutants would have in the absence of human activities. The actual concentration need not be large for a substance to be a pollutant; in fact, the numerical value tells us little until we know how much of an increase this represents over the concentration that would occur naturally in the area. For example, sulfur dioxide has detectable health effects at 0.08 parts per million (ppm), which is about 400 times its natural level. Carbon monoxide, however, has a natural level of 0.1 ppm and is not usually a pollutant until its level reaches about 15 ppm.What does the passage mainly discuss?

Tiếng Anh Tốt nghiệp THPT
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Bài 4: Công thức nghiệm của phương trình bậc hai

Không giải phương trình, hãy xác định các hệ số a, b, c, tính biệt thức Δ và xác định số nghiệm của mỗi phương trình sau:7x2-2x+3=0

Toán Lớp 9
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KỲ THI THỬ THPT QUỐC GIA NĂM 2019 MÔN TIẾNG ANH(P9)

Choose the word whose underlined part is pronounced differently from the others

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 585 lượt xem 5 năm trước
Kỳ thi thử thpt quốc gia lần 1 năm 2019 môn Tiếng Anh cực hay có lời giải(Đề 4)

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word  or phrase that best fits each of the numbered blanks. Fill in the appropriate word in question 44      It is relatively easy for computers to speak. A computer that says ‘please’ and ‘thank you’  in the right    places is (35) ___   miracle of science ,but recognizing the words that make up normal , continuous human speech is another (36) ___      Not until now have computer been programmed to (37) ___ to a range of spoken commands.Until recently it was thought that computers would have tobe programmed to the accent and speech hahits of each user,and only then would be able to respond(38) ___to their master’s or mistress’s voice.Now rapid progress is being made (39) ______systems programmed to adapt easily to each new speaker.     The IBM Tangora system,under development at the end of 1980s was claimed to (40) ______a spoken vocabulary of 20,000 words with 95 percent accuracy. The system includes a processor that can  make informed guesses as to(41)______is a likely sentence.That system has been programmed not only with grammatical rules,but also with an analyssis of a vast quantity of office correspondence.On the(42) ______ of this information ,the machine can calculate the probability of one particular word following another.      Statistical probability is necessary for computers to interpret not only speech but also(43) ______data.Security systems can distinguish between faces they have been taught to recognize,but never has a computerbeen able to match a human’s ability to make sense of a three-dimemsional scene(44) ______identifying all objects in it.                  (From ‘Heinle & Heinle TOEFL Test Assistant .Grammar’ by Milada Broukal)

Tiếng Anh Tốt nghiệp THPT
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Bài tập thủy phân este đa chức

Este X được tạo thành từ axit oxalic và hai ancol đơn chức. Trong phân tử X, số nguyên tử cacbon nhiều hơn số nguyên tử oxi là 1. Khi cho m gam X tác dụng với dung dịch NaOH dư, sau khi phản ứng hoàn toàn có 9,6 gam NaOH đã phản ứng. Giá trị của m là

Hóa học Tốt nghiệp THPT
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Bài 4: Công thức nghiệm của phương trình bậc hai

Áp dụng công thức nghiệm để giải các phương trình: -3x2 + x + 5 = 0

Toán Lớp 9
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30 đề thi thử đề thi thử THPTQG môn Tiếng Anh có lời giải chi tiết (Đề số 25)

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase for each of the blanks.Every culture has its own (45)_______list of behavior that is acceptable. Every society (46)_______has its taboos, or types of behavior that are considered 3 violation of (47)_______manners. If you travel to (48)_______country, on business or vacation, it is really (49)_______to learn some of that country's customs so that you (50)_______insult the local people there.The word “taboo” comes from the Tongan language and it used in (51)_______English to describe verbal and non-verbal behavior that is forbidden or to be ( 52)_______. In spite of people's common thought, taboos are not universal and they tend to be ( 53)_______to certain culture or country, and usually form around a community’s values and beliefs. (54)_______, what is considered acceptable behavior in one country may be a serious taboo in another.Điền vào vị trí 49

Tiếng Anh Tốt nghiệp THPT
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Tổng hợp đề thi thử mới nhất môn tiếng anh cực hay có lời giải (P9)

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions.By adopting a few simple techniques, parents who read to their children can substantially increase their children’s language development. It’s surprising, but true. How parents talk to their children makes a big difference in the children’s language development. If a parent encourages the child to actively respond to what the parent is reading, the child’s language skills increase.A study was done with 2 to 3 year-old children and their parents. Half of the thirty children participated in the experimental study; the other half acted as the control group. In the experimental group, the parents were given a two-hour training session in which they were taught to ask open-ended questions rather than yes/no questions. For example, the parent should ask, “what is the doggie doing?” rather than, “Is the doggie running away?” Experimental parents were also instructed in how to expand on their children’s answers, how to suggest alternative possibilities, and how to praise correct answers.At the beginning of the study, the children did not differ on measures of language development, but at the end of one month the children in the experimental group tested 5.5 months ahead of the control group on a test of verbal expression and vocabulary. Nine months later, the children in the experimental group still showed an advance of 6 months over the children in the control group. Which of the following can be inferred from this passage?

Tiếng Anh Tốt nghiệp THPT
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Kỳ thi thử thpt quốc gia lần 1 năm 2019 môn Tiếng Anh cực hay có lời giải(Đề 4)

 Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word  or phrase that best fits each of the numbered blanks. Fill in the appropriate word in question 43      It is relatively easy for computers to speak. A computer that says ‘please’ and ‘thank you’  in the right    places is (35) ___   miracle of science ,but recognizing the words that make up normal , continuous human speech is another (36) ___      Not until now have computer been programmed to (37) ___ to a range of spoken commands.Until recently it was thought that computers would have tobe programmed to the accent and speech hahits of each user,and only then would be able to respond(38) ___to their master’s or mistress’s voice.Now rapid progress is being made (39) ______systems programmed to adapt easily to each new speaker.     The IBM Tangora system,under development at the end of 1980s was claimed to (40) ______a spoken vocabulary of 20,000 words with 95 percent accuracy. The system includes a processor that can  make informed guesses as to(41)______is a likely sentence.That system has been programmed not only with grammatical rules,but also with an analyssis of a vast quantity of office correspondence.On the(42) ______ of this information ,the machine can calculate the probability of one particular word following another.      Statistical probability is necessary for computers to interpret not only speech but also(43) ______data.Security systems can distinguish between faces they have been taught to recognize,but never has a computerbeen able to match a human’s ability to make sense of a three-dimemsional scene(44) ______identifying all objects in it.                  (From ‘Heinle & Heinle TOEFL Test Assistant .Grammar’ by Milada Broukal) 

Tiếng Anh Tốt nghiệp THPT
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KỲ THI THỬ THPT QUỐC GIA NĂM 2019 MÔN TIẾNG ANH(P9)

Choose the word whose underlined part is pronounced differently from the others

Tiếng Anh Tốt nghiệp THPT
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Đề luyện thi THPT quốc gia môn tiếng anh có lời giải (Đề số 06)

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word for each of the blanks from 1 to 10.Researchers in communication show that more feelings and intentions are (1) _______ and received nonverbally than verbally. Mehrabian and Wienerfollowing have stated that only 7% (2) _______ message is sent through words, with remaining 93% sent nonverbal (3) _______. Humans use nonverbal communication because:1. Words have limitations: There are (4) _______ areas where nonverbal communication is more (5) v than verbal, especially when we explain the shape, directions, personalities which are expressed nonverbally. 2. Nonverbal signal are powerful: Nonverbal cues primarily express inner (6) _______ while verbal messages deal basically with outside world. 3. Nonverbal message are likely (7) _______ more genuine: because nonverbal behaviors cannot be controlled as easily as spoken words. 4. Nonverbal signals can express feelings inappropriate to state: Social etiquette limits (8) _______ can be said, but nonverbal cues can communicate thoughts. 5. A separate communication channel is necessary to (9) _______ send complex messages: A speaker can add enormously to the complexity of the verbal message through simple nonverbal (10) _______.Điền ô số 7

Tiếng Anh Tốt nghiệp THPT
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Kỳ thi thử thpt quốc gia lần 1 năm 2019 môn Tiếng Anh cực hay có lời giải(Đề 4)

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word  or phrase that best fits each of the numbered blanks. Fill in the appropriate word in question 42      It is relatively easy for computers to speak. A computer that says ‘please’ and ‘thank you’  in the right    places is (35) ___   miracle of science ,but recognizing the words that make up normal , continuous human speech is another (36) ___      Not until now have computer been programmed to (37) ___ to a range of spoken commands.Until recently it was thought that computers would have tobe programmed to the accent and speech hahits of each user,and only then would be able to respond(38) ___to their master’s or mistress’s voice.Now rapid progress is being made (39) ______systems programmed to adapt easily to each new speaker.     The IBM Tangora system,under development at the end of 1980s was claimed to (40) ______a spoken vocabulary of 20,000 words with 95 percent accuracy. The system includes a processor that can  make informed guesses as to(41)______is a likely sentence.That system has been programmed not only with grammatical rules,but also with an analyssis of a vast quantity of office correspondence.On the(42) ______ of this information ,the machine can calculate the probability of one particular word following another.      Statistical probability is necessary for computers to interpret not only speech but also(43) ______data.Security systems can distinguish between faces they have been taught to recognize,but never has a computerbeen able to match a human’s ability to make sense of a three-dimemsional scene(44) ______identifying all objects in it.                  (From ‘Heinle & Heinle TOEFL Test Assistant .Grammar’ by Milada Broukal)

Tiếng Anh Tốt nghiệp THPT
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Bài 4: Công thức nghiệm của phương trình bậc hai

Áp dụng công thức nghiệm để giải các phương trình: 4x2 – 4x + 1 = 0

Toán Lớp 9
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KỲ THI THỬ THPT QUỐC GIA NĂM 2019 MÔN TIẾNG ANH(P9)

Choose the word or phrase that is OPPOSITE in meaning to the underlined part in each of the following questions.She performed all her duties conscientiously. She didn't give enough care to her work

Tiếng Anh Tốt nghiệp THPT
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Kỳ thi thử thpt quốc gia lần 1 năm 2019 môn Tiếng Anh cực hay có lời giải(Đề 4)

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word  or phrase that best fits each of the numbered blanks. Fill in the appropriate word in question 41      It is relatively easy for computers to speak. A computer that says ‘please’ and ‘thank you’  in the right    places is (35) ___   miracle of science ,but recognizing the words that make up normal , continuous human speech is another (36) ___      Not until now have computer been programmed to (37) ___ to a range of spoken commands.Until recently it was thought that computers would have tobe programmed to the accent and speech hahits of each user,and only then would be able to respond(38) ___to their master’s or mistress’s voice.Now rapid progress is being made (39) ______systems programmed to adapt easily to each new speaker.     The IBM Tangora system,under development at the end of 1980s was claimed to (40) ______a spoken vocabulary of 20,000 words with 95 percent accuracy. The system includes a processor that can  make informed guesses as to(41)______is a likely sentence.That system has been programmed not only with grammatical rules,but also with an analyssis of a vast quantity of office correspondence.On the(42) ______ of this information ,the machine can calculate the probability of one particular word following another.      Statistical probability is necessary for computers to interpret not only speech but also(43) ______data.Security systems can distinguish between faces they have been taught to recognize,but never has a computerbeen able to match a human’s ability to make sense of a three-dimemsional scene(44) ______identifying all objects in it.                  (From ‘Heinle & Heinle TOEFL Test Assistant .Grammar’ by Milada Broukal)

Tiếng Anh Tốt nghiệp THPT
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BÀI TẬP VỀ PHẢN ỨNG ĐỐT CHÁY

Hỗn hợp X gồm 1 axit A, B trong đó MA<MB, nA:nB=3:2,. Chia X làm hai phần bằng nhau.Phần 1: đem đốt cháy hoàn toàn thu được 6,272 lít CO2 (đktc)Phần 2: cho tác dụng hoàn toàn với dung dịch hỗn hợp NaOH 1,2M; KOH 1,6M thấy có 100ml dung dịch đã phản ứng. Cô cạn dung dịch thu được m gam chất rắng khan.Giá trị của m là:

Hóa học Lớp 11
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Kỳ thi thử thpt quốc gia lần 1 năm 2019 môn Tiếng Anh cực hay có lời giải(Đề 4)

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word  or phrase that best fits each of the numbered blanks. Fill in the appropriate word in question 40      It is relatively easy for computers to speak. A computer that says ‘please’ and ‘thank you’  in the right    places is (35) ___   miracle of science ,but recognizing the words that make up normal , continuous human speech is another (36) ___      Not until now have computer been programmed to (37) ___ to a range of spoken commands.Until recently it was thought that computers would have tobe programmed to the accent and speech hahits of each user,and only then would be able to respond(38) ___to their master’s or mistress’s voice.Now rapid progress is being made (39) ______systems programmed to adapt easily to each new speaker.     The IBM Tangora system,under development at the end of 1980s was claimed to (40) ______a spoken vocabulary of 20,000 words with 95 percent accuracy. The system includes a processor that can  make informed guesses as to(41)______is a likely sentence.That system has been programmed not only with grammatical rules,but also with an analyssis of a vast quantity of office correspondence.On the(42) ______ of this information ,the machine can calculate the probability of one particular word following another.      Statistical probability is necessary for computers to interpret not only speech but also(43) ______data.Security systems can distinguish between faces they have been taught to recognize,but never has a computerbeen able to match a human’s ability to make sense of a three-dimemsional scene(44) ______identifying all objects in it.                  (From ‘Heinle & Heinle TOEFL Test Assistant .Grammar’ by Milada Broukal)

Tiếng Anh Tốt nghiệp THPT
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Tổng hợp đề thi thử mới nhất môn tiếng anh cực hay có lời giải (P9)

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions. Do you ever wish you were more optimistic, someone who always (45)____ to be successful? Having someone around who always fears the worst isn't really a lot of (46)____ - we all know someone who sees a single cloud on a sunny day and says, 'It looks like rain.' But if you catch yourself thinking such things, it's important to do something about it. You can change your view of life, according to psychologist. It only takes a little (47)___, and you'll find life more rewarding as a (48)____. Optimism, they say, is partly about self-respect and confidence but it's also a more positive way of looking at life and all it has to (49)____. Optimists are more (50)_____ to start new projects and are generally more prepared to take risks.Upbringing is obviously very important in forming your (51)___ to the world. Some people are brought up to depend too much on others and grow up forever blaming other people when anything (52)____ wrong. Most optimists, on the (53)____ hand, have been brought up not to (54)____ failure as the end of the world - they just get on with their lives.Điền vào ô 54

Tiếng Anh Tốt nghiệp THPT
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Bài 4: Công thức nghiệm của phương trình bậc hai

Áp dụng công thức nghiệm để giải các phương trình: 5x2 – x + 2 = 0

Toán Lớp 9
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KỲ THI THỬ THPT QUỐC GIA NĂM 2019 MÔN TIẾNG ANH(P9)

Choose the word or phrase that is OPPOSITE in meaning to the underlined part in each of the following questions.She decided to remain celibate and devote her life to helping the homeless and orphans.

Tiếng Anh Tốt nghiệp THPT
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KIM LOẠI PHẢN ỨNG VỚI MUỐI

Cho hỗn hợp X gồm 0,09 mol Fe và 0,05 mol Fe(NO3)2.7H2O vào 500 ml dung dịch HCl 1M, kết thúc phản ứng thu được dung dịch Y và khí NO (sản phẩm khử duy nhất). Hỏi dung dịch Y hoà tan tối đa bao nhiêu gam Cu

Hóa học Lớp 12
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Kỳ thi thử thpt quốc gia lần 1 năm 2019 môn Tiếng Anh cực hay có lời giải(Đề 4)

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word  or phrase that best fits each of the numbered blanks. Fill in the appropriate word in question 39      It is relatively easy for computers to speak. A computer that says ‘please’ and ‘thank you’  in the right    places is (35) ___   miracle of science ,but recognizing the words that make up normal , continuous human speech is another (36) ___      Not until now have computer been programmed to (37) ___ to a range of spoken commands.Until recently it was thought that computers would have tobe programmed to the accent and speech hahits of each user,and only then would be able to respond(38) ___to their master’s or mistress’s voice.Now rapid progress is being made (39) ______systems programmed to adapt easily to each new speaker.     The IBM Tangora system,under development at the end of 1980s was claimed to (40) ______a spoken vocabulary of 20,000 words with 95 percent accuracy. The system includes a processor that can  make informed guesses as to(41)______is a likely sentence.That system has been programmed not only with grammatical rules,but also with an analyssis of a vast quantity of office correspondence.On the(42) ______ of this information ,the machine can calculate the probability of one particular word following another.      Statistical probability is necessary for computers to interpret not only speech but also(43) ______data.Security systems can distinguish between faces they have been taught to recognize,but never has a computerbeen able to match a human’s ability to make sense of a three-dimemsional scene(44) ______identifying all objects in it.                  (From ‘Heinle & Heinle TOEFL Test Assistant .Grammar’ by Milada Broukal)

Tiếng Anh Tốt nghiệp THPT
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Bài 4: Công thức nghiệm của phương trình bậc hai

Hãy giải thích vì sao khi Δ < 0 thì phương trình vô nghiệm.

Toán Lớp 9
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Kỳ thi thử thpt quốc gia lần 1 năm 2019 môn Tiếng Anh cực hay có lời giải(Đề 4)

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word  or phrase that best fits each of the numbered blanks. Fill in the appropriate word in question 38      It is relatively easy for computers to speak. A computer that says ‘please’ and ‘thank you’  in the right    places is (35) ___   miracle of science ,but recognizing the words that make up normal , continuous human speech is another (36) ___      Not until now have computer been programmed to (37) ___ to a range of spoken commands.Until recently it was thought that computers would have tobe programmed to the accent and speech hahits of each user,and only then would be able to respond(38) ___to their master’s or mistress’s voice.Now rapid progress is being made (39) ______systems programmed to adapt easily to each new speaker.     The IBM Tangora system,under development at the end of 1980s was claimed to (40) ______a spoken vocabulary of 20,000 words with 95 percent accuracy. The system includes a processor that can  make informed guesses as to(41)______is a likely sentence.That system has been programmed not only with grammatical rules,but also with an analyssis of a vast quantity of office correspondence.On the(42) ______ of this information ,the machine can calculate the probability of one particular word following another.      Statistical probability is necessary for computers to interpret not only speech but also(43) ______data.Security systems can distinguish between faces they have been taught to recognize,but never has a computerbeen able to match a human’s ability to make sense of a three-dimemsional scene(44) ______identifying all objects in it.                  (From ‘Heinle & Heinle TOEFL Test Assistant .Grammar’ by Milada Broukal)

Tiếng Anh Tốt nghiệp THPT
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KỲ THI THỬ THPT QUỐC GIA NĂM 2019 MÔN TIẾNG ANH(P9)

Choose the word or phrase that is OPPOSITE in meaning to the underlined part in each of the following questions.Their classmates are writing letters of acceptance.

Tiếng Anh Tốt nghiệp THPT
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Tổng hợp đề thi thử mới nhất môn tiếng anh cực hay có lời giải (P9)

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions. Do you ever wish you were more optimistic, someone who always (45)____ to be successful? Having someone around who always fears the worst isn't really a lot of (46)____ - we all know someone who sees a single cloud on a sunny day and says, 'It looks like rain.' But if you catch yourself thinking such things, it's important to do something about it. You can change your view of life, according to psychologist. It only takes a little (47)___, and you'll find life more rewarding as a (48)____. Optimism, they say, is partly about self-respect and confidence but it's also a more positive way of looking at life and all it has to (49)____. Optimists are more (50)_____ to start new projects and are generally more prepared to take risks.Upbringing is obviously very important in forming your (51)___ to the world. Some people are brought up to depend too much on others and grow up forever blaming other people when anything (52)____ wrong. Most optimists, on the (53)____ hand, have been brought up not to (54)____ failure as the end of the world - they just get on with their lives.Điền vào ô 53

Tiếng Anh Tốt nghiệp THPT
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Kỳ thi thử thpt quốc gia lần 1 năm 2019 môn Tiếng Anh cực hay có lời giải(Đề 4)

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word  or phrase that best fits each of the numbered blanks. Fill in the appropriate word in question 37      It is relatively easy for computers to speak. A computer that says ‘please’ and ‘thank you’  in the right    places is (35) ___   miracle of science ,but recognizing the words that make up normal , continuous human speech is another (36) ___      Not until now have computer been programmed to (37) ___ to a range of spoken commands.Until recently it was thought that computers would have tobe programmed to the accent and speech hahits of each user,and only then would be able to respond(38) ___to their master’s or mistress’s voice.Now rapid progress is being made (39) ______systems programmed to adapt easily to each new speaker.     The IBM Tangora system,under development at the end of 1980s was claimed to (40) ______a spoken vocabulary of 20,000 words with 95 percent accuracy. The system includes a processor that can  make informed guesses as to(41)______is a likely sentence.That system has been programmed not only with grammatical rules,but also with an analyssis of a vast quantity of office correspondence.On the(42) ______ of this information ,the machine can calculate the probability of one particular word following another.      Statistical probability is necessary for computers to interpret not only speech but also(43) ______data.Security systems can distinguish between faces they have been taught to recognize,but never has a computerbeen able to match a human’s ability to make sense of a three-dimemsional scene(44) ______identifying all objects in it.                  (From ‘Heinle & Heinle TOEFL Test Assistant .Grammar’ by Milada Broukal)

Tiếng Anh Tốt nghiệp THPT
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Tổng hợp đề thi thử mới nhất môn tiếng anh cực hay có lời giải (P9)

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions. Do you ever wish you were more optimistic, someone who always (45)____ to be successful? Having someone around who always fears the worst isn't really a lot of (46)____ - we all know someone who sees a single cloud on a sunny day and says, 'It looks like rain.' But if you catch yourself thinking such things, it's important to do something about it. You can change your view of life, according to psychologist. It only takes a little (47)___, and you'll find life more rewarding as a (48)____. Optimism, they say, is partly about self-respect and confidence but it's also a more positive way of looking at life and all it has to (49)____. Optimists are more (50)_____ to start new projects and are generally more prepared to take risks.Upbringing is obviously very important in forming your (51)___ to the world. Some people are brought up to depend too much on others and grow up forever blaming other people when anything (52)____ wrong. Most optimists, on the (53)____ hand, have been brought up not to (54)____ failure as the end of the world - they just get on with their lives.Điền vào ô 52

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 1.2 K lượt xem 5 năm trước
Bài tập thủy phân este đa chức

Một este X mạch hở tạo từ axit đơn chức và etilen glicol. Hoá hơi a gam X thu được thể tích hơi bằng thể tích của 6,4 gam O2 (ở cùng điều kiện). Mặt khác a gam X tác dụng hết với dung dịch NaOH đun nóng thu được 32,8 gam muối. Công thức cấu tạo của X là

Hóa học Tốt nghiệp THPT
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Kỳ thi thử thpt quốc gia lần 1 năm 2019 môn Tiếng Anh cực hay có lời giải(Đề 4)

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word  or phrase that best fits each of the numbered blanks. Fill in the appropriate word in question 36      It is relatively easy for computers to speak. A computer that says ‘please’ and ‘thank you’  in the right    places is (35) ___   miracle of science ,but recognizing the words that make up normal , continuous human speech is another (36) ___      Not until now have computer been programmed to (37) ___ to a range of spoken commands.Until recently it was thought that computers would have tobe programmed to the accent and speech hahits of each user,and only then would be able to respond(38) ___to their master’s or mistress’s voice.Now rapid progress is being made (39) ______systems programmed to adapt easily to each new speaker.     The IBM Tangora system,under development at the end of 1980s was claimed to (40) ______a spoken vocabulary of 20,000 words with 95 percent accuracy. The system includes a processor that can  make informed guesses as to(41)______is a likely sentence.That system has been programmed not only with grammatical rules,but also with an analyssis of a vast quantity of office correspondence.On the(42) ______ of this information ,the machine can calculate the probability of one particular word following another.      Statistical probability is necessary for computers to interpret not only speech but also(43) ______data.Security systems can distinguish between faces they have been taught to recognize,but never has a computerbeen able to match a human’s ability to make sense of a three-dimemsional scene(44) ______identifying all objects in it.                  (From ‘Heinle & Heinle TOEFL Test Assistant .Grammar’ by Milada Broukal)

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 1.3 K lượt xem 5 năm trước
Kỳ thi thử thpt quốc gia lần 1 năm 2019 môn Tiếng Anh cực hay có lời giải(Đề 4)

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word  or phrase that best fits each of the numbered blanks. Fill in the appropriate word in question 35      It is relatively easy for computers to speak. A computer that says ‘please’ and ‘thank you’  in the right    places is (35) ___   miracle of science ,but recognizing the words that make up normal , continuous human speech is another (36) ___      Not until now have computer been programmed to (37) ___ to a range of spoken commands.Until recently it was thought that computers would have tobe programmed to the accent and speech hahits of each user,and only then would be able to respond(38) ___to their master’s or mistress’s voice.Now rapid progress is being made (39) ______systems programmed to adapt easily to each new speaker.     The IBM Tangora system,under development at the end of 1980s was claimed to (40) ______a spoken vocabulary of 20,000 words with 95 percent accuracy. The system includes a processor that can  make informed guesses as to(41)______is a likely sentence.That system has been programmed not only with grammatical rules,but also with an analyssis of a vast quantity of office correspondence.On the(42) ______ of this information ,the machine can calculate the probability of one particular word following another.      Statistical probability is necessary for computers to interpret not only speech but also(43) ______data.Security systems can distinguish between faces they have been taught to recognize,but never has a computerbeen able to match a human’s ability to make sense of a three-dimemsional scene(44) ______identifying all objects in it.                  (From ‘Heinle & Heinle TOEFL Test Assistant .Grammar’ by Milada Broukal)

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 4.3 K lượt xem 5 năm trước
Tổng hợp đề thi thử mới nhất môn tiếng anh cực hay có lời giải (P9)

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions. Do you ever wish you were more optimistic, someone who always (45)____ to be successful? Having someone around who always fears the worst isn't really a lot of (46)____ - we all know someone who sees a single cloud on a sunny day and says, 'It looks like rain.' But if you catch yourself thinking such things, it's important to do something about it. You can change your view of life, according to psychologist. It only takes a little (47)___, and you'll find life more rewarding as a (48)____. Optimism, they say, is partly about self-respect and confidence but it's also a more positive way of looking at life and all it has to (49)____. Optimists are more (50)_____ to start new projects and are generally more prepared to take risks.Upbringing is obviously very important in forming your (51)___ to the world. Some people are brought up to depend too much on others and grow up forever blaming other people when anything (52)____ wrong. Most optimists, on the (53)____ hand, have been brought up not to (54)____ failure as the end of the world - they just get on with their lives.Điền vào ô 51

Tiếng Anh Tốt nghiệp THPT
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Kỳ thi thử thpt quốc gia lần 1 năm 2019 môn Tiếng Anh cực hay có lời giải(Đề 4)

Mark the letter A, B, C, or D on your answer sheet to show the underlined part that needs correction. It’s(A) not that I don’t like her, but I object (B) to be called (C) that by her. I am  not her“buddy”, (D) am I?

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 11.1 K lượt xem 5 năm trước
Bài tập thủy phân este đa chức

Thủy phân hoàn toàn 0,1 mol este X bằng NaOH, thu được một muối của axit cacboxylic Y và 7,6 gam ancol Z. Chất Y có phản ứng tráng bạc, Z hòa tan được Cu(OH)2 cho dung dịch màu xanh lam. Công thức cấu tạo của X là

Hóa học Tốt nghiệp THPT
Xem chi tiết 1.9 K lượt xem 5 năm trước
30 đề thi thử đề thi thử THPTQG môn Tiếng Anh có lời giải chi tiết (Đề số 25)

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase for each of the blanks.Every culture has its own (45)_______list of behavior that is acceptable. Every society (46)_______has its taboos, or types of behavior that are considered 3 violation of (47)_______manners. If you travel to (48)_______country, on business or vacation, it is really (49)_______to learn some of that country's customs so that you (50)_______insult the local people there.The word “taboo” comes from the Tongan language and it used in (51)_______English to describe verbal and non-verbal behavior that is forbidden or to be ( 52)_______. In spite of people's common thought, taboos are not universal and they tend to be ( 53)_______to certain culture or country, and usually form around a community’s values and beliefs. (54)_______, what is considered acceptable behavior in one country may be a serious taboo in another.Điền vào vị trí 48

Tiếng Anh Tốt nghiệp THPT
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Tổng hợp đề thi thử mới nhất môn tiếng anh cực hay có lời giải (P9)

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions. Do you ever wish you were more optimistic, someone who always (45)____ to be successful? Having someone around who always fears the worst isn't really a lot of (46)____ - we all know someone who sees a single cloud on a sunny day and says, 'It looks like rain.' But if you catch yourself thinking such things, it's important to do something about it. You can change your view of life, according to psychologist. It only takes a little (47)___, and you'll find life more rewarding as a (48)____. Optimism, they say, is partly about self-respect and confidence but it's also a more positive way of looking at life and all it has to (49)____. Optimists are more (50)_____ to start new projects and are generally more prepared to take risks.Upbringing is obviously very important in forming your (51)___ to the world. Some people are brought up to depend too much on others and grow up forever blaming other people when anything (52)____ wrong. Most optimists, on the (53)____ hand, have been brought up not to (54)____ failure as the end of the world - they just get on with their lives.Điền vào ô 50

Tiếng Anh Tốt nghiệp THPT
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Kỳ thi thử thpt quốc gia lần 1 năm 2019 môn Tiếng Anh cực hay có lời giải(Đề 4)

Mark the letter A, B, C, or D on your answer sheet to show the underlined part that needs correction. Lake Superior,(A)  that (B) lies on the US Canadian border, is the (C) largest lake (D) in North    

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 3.6 K lượt xem 5 năm trước
Kỳ thi thử thpt quốc gia lần 1 năm 2019 môn Tiếng Anh cực hay có lời giải(Đề 4)

 Mark the letter A, B, C, or D on your answer sheet to show the underlined part that needs correction. (A) What I told her a few days ago (B) were not the solutions (C) to (D) most of her problems 

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 785 lượt xem 5 năm trước
Bài tập thủy phân este đa chức

Thủy phân 0,01 mol este của một ancol đa chức với một axit đơn chức cần 1,2 gam NaOH. Mặt khác khi thủy phân 4,36 gam este đó thì cần 2,4 gam NaOH và thu được 4,92 gam muối. Công thức của este là

Hóa học Tốt nghiệp THPT
Xem chi tiết 2.4 K lượt xem 5 năm trước
Bài 4: Công thức nghiệm của phương trình bậc hai

Hãy điền những biểu thức thích hợp vào các ô trống (…) dưới đây:Nếu Δ = 0 thì từ phương trình (2) suy ra (x+ b/2a)2 = … Do đó, phương trình (1) có nghiệm kép x = …

Toán Lớp 9
Xem chi tiết 2 K lượt xem 1 năm trước
Tổng hợp đề thi thử mới nhất môn tiếng anh cực hay có lời giải (P9)

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions. Do you ever wish you were more optimistic, someone who always (45)____ to be successful? Having someone around who always fears the worst isn't really a lot of (46)____ - we all know someone who sees a single cloud on a sunny day and says, 'It looks like rain.' But if you catch yourself thinking such things, it's important to do something about it. You can change your view of life, according to psychologist. It only takes a little (47)___, and you'll find life more rewarding as a (48)____. Optimism, they say, is partly about self-respect and confidence but it's also a more positive way of looking at life and all it has to (49)____. Optimists are more (50)_____ to start new projects and are generally more prepared to take risks.Upbringing is obviously very important in forming your (51)___ to the world. Some people are brought up to depend too much on others and grow up forever blaming other people when anything (52)____ wrong. Most optimists, on the (53)____ hand, have been brought up not to (54)____ failure as the end of the world - they just get on with their lives.Điền vào ô 49

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 4 K lượt xem 5 năm trước
KỲ THI THỬ THPT QUỐC GIA NĂM 2019 MÔN TIẾNG ANH(P9)

Yesterday evening I ______ a terrible accident.

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 7 K lượt xem 11 tháng trước
Bài 4: Công thức nghiệm của phương trình bậc hai

Hãy điền những biểu thức thích hợp vào các ô trống (…) dưới đây:Nếu Δ > 0 thì từ phương trình (2) suy ra x + b/2a = ± …Do đó, phương trình (1) có hai nghiệm x1 = …, x2 = …

Toán Lớp 9
Xem chi tiết 2.1 K lượt xem 1 năm trước
Tổng hợp đề thi Tiếng Anh có lời giải (Đề số 14)

Can I carry these suitcases into the room for you?- “______”

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 16.4 K lượt xem 5 năm trước
Bài 3: Phương trình bậc hai một ẩn

Hãy giải phương trình : 2x2 + 5x + 2 = 0 theo các bước như ví dụ 3 trong bài học.

Toán Lớp 9
Xem chi tiết 23.6 K lượt xem 1 năm trước
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