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Bài tập Toán 8: Ôn tập chương 1 (P1)

Phân tích đa thức thành nhân tử:a) x4 + 1 - 2x2;                          b) x2 - y2 - 5y + 5x;c) y2 - 4x2 +4x - 1;                    d) x3(2 + x)2 - (x + 2)2 + 1 - x3.

Toán Lớp 8
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Bài tập Toán 8: Ôn tập chương 1 (P1)

Chứng minh rằng giá trị của biểu thức sau không phụ thuộc vào giá trị của biến x:B = (3 - x)(x2 + 3x + 9) - (x + 2)3 + 2(x + 2)(4 - 2x + x2) + 6x(x + 2)

Toán Lớp 8
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Tổng hợp bộ đề thi thử THPTQG môn Tiếng Anh các năm Đề 39

I don’t think Jill would be a good teacher. She’s got little patience, _____?

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 1.6 K lượt xem 5 năm trước
Bài tập Toán 8: Ôn tập chương 1 (P1)

Chứng minh rằng giá trị của biểu thức sau không phụ thuộc vào giá trị của biến x:A = (x - 1)(x2 + x + 1) + (x - 2)3 - 2(x + 1)(x2 - x +1) + 6(x - 1)2.

Toán Lớp 8
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Bài tập Toán 8: Ôn tập chương 1 (P1)

Tính giá trị biểu thức:a) M = (a - 2b)(a2 + 2ab + 4b2) + (2b - a)3 tại a = -1; b = 2;b) N = (2xy - 2)(2xy + 3) - (1 - 2xy)2 tại x = 12; y = -1.

Toán Lớp 8
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Bài tập Toán 8: Ôn tập chương 1 (P1)

Tính giá trị biểu thức: a) A = (1 – 3m)(9m2 + 3m + l) - (6 - 26m3) tại m = 5;b) B = (2x - 3)2 + (2x +1)2 - 2(4x2 - 9) tại x = 3.

Toán Lớp 8
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Bài tập Toán 8: Ôn tập chương 1 (P1)

Hoàn thiện các hằng đẳng thức sau:a) 4x4 + 12x2y + ... = (2x2 + ...)b) … - 4xy+ 4 = (2  - ...)2;c) -4x2 - … + … = -(2x - y)2;d) (-2x + …) (… - y2) = 4x2 - y4.

Toán Lớp 8
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Bài tập Toán 8: Ôn tập chương 1 (P1)

Điền các đơn thức vào chỗ để hoàn thành các hằng đẳng thức sau:a) x2 + 4x + ... = (x + ...)2;       b) ...-12x + 9 = (2x-...)2;c) 4x2 +...+... (2x-3y)2;           d) x−...(...+y2)=...−y24.

Toán Lớp 8
Xem chi tiết 5.8 K lượt xem 2 năm trước
Bài tập Toán 8: Ôn tập chương 1 (P1)

Thực hiện phép tính:a) M = (x - 1)(x - 2)(x + 2) - (x - 3)3;b) N = (xy - 1)(xy - 2) - (xy - 2)2.

Toán Lớp 8
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Bài tập Toán 8: Ôn tập chương 1 (P1)

Rút gọn biểu thức:a) A = x2(x - 2) - (x - 1)(x2 + x + 1);b) B = (xy - 1)2 - (xy - 1)(xy + 2).

Toán Lớp 8
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Bài tập Toán 8: Chia đa thức cho đơn thức đã sắp xếp

Tìm các hệ số a, b và c biết:a) Đa thức x3 +2ax + b chia hết cho đa thức x - 1 còn khi chia cho đa thức x + 2 được dư là 3.b) Đa thức ax3 + bx2 + c khi chia cho đa thức x dư - 3 còn khi chia cho đa thức x2 - 4 được dư là 4x - 11.

Toán Lớp 8
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Bài tập Toán 8: Chia đa thức cho đơn thức đã sắp xếp

Tìm a và b để đa thức A chia hết cho đa thức B với:a) A = 4x3 + 15x2 + 24x + 3 + a và B = x2 + 4x + 7;b) A = x4 +3x3 - x2 + (2a - 3)x + 3b + a và B = x2 + 3x - 1.

Toán Lớp 8
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Bài tập Toán 8: Chia đa thức cho đơn thức đã sắp xếp

Tìm đa thức M biết:a) 2x3 + 9x2 + 15x + 9 = M.(2x + 3);b) (2x2 - 2x +1 ).M = 6x4 - 4x3 + x2 + x.

Toán Lớp 8
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Bài tập Toán 8: Chia đa thức cho đơn thức đã sắp xếp

Tính nhanh:a) (8x3 +1) : (4x2 - 2x +1);b) (x2 - 3x + xy - 3y) : (x + y);c) (a3b3 - 6a2b2c + 12abc2 - 8c3) : (2c - ab).

Toán Lớp 8
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Bài tập Toán 8: Chia đa thức cho đơn thức đã sắp xếp

Thực hiện phép chia:a) (x3 -2x2 - 15x + 36) : (x + 4);b) (2x4 + 2x3 + 3x2 - 5x - 20) : (x2 + x + 4);c) (2x3 + 11x2 + 18x-3) : (2x + 3);d) (2x3 + 9x2 +5x + 41) : (2x2 - x + 9).

Toán Lớp 8
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Bài tập Toán 8: Chia đa thức cho đơn thức đã sắp xếp

Tìm a và b biết đa thức x3 +ax + b khi chia cho đa thức x-1 dư là 4 còn khi chia cho đa thức x - 5 dư là 112.

Toán Lớp 8
Xem chi tiết 3.6 K lượt xem 2 năm trước
Bài tập Toán 8: Chia đa thức cho đơn thức đã sắp xếp

Tìm a và b để đa thức A chia hết cho đa thức B với:a) A = x3 - 9x2 +17x - 25 + a và B = x2 - 2x + 3;b) A = x4 - 7x3 +10x2 +(a - 1)x + b - a và B = x2 -6x + 5.

Toán Lớp 8
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Bài tập Toán 8: Chia đa thức cho đơn thức đã sắp xếp

Tìm a và b để đa thức A chia hết cho đa thức B với:a) A = x4 - x3 + 6x2 - x + a và B = x2 - x + 5;b) A = x4 - 9x3 + 21x2 +ax + b và B = x2 - x - 2.

Toán Lớp 8
Xem chi tiết 15.6 K lượt xem 2 năm trước
Bài tập Toán 8: Chia đa thức cho đơn thức đã sắp xếp

Tìm đa thức M biết:a) 2x6 -x4-2x2+1 = M.(2x2 -1);b) (x2 +x + 1).M = x4 - x3 - 4x2 - 5x - 3.

Toán Lớp 8
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Bài tập Toán 8: Chia đa thức cho đơn thức đã sắp xếp

Tìm đa thức M biết:a) x3 - 5x2 +x - 5 = (x - 5).M;b) (x2 - 4x - 3).M = 2x4 - 13x3 + 14x2 + 15x.

Toán Lớp 8
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Bài tập Toán 8: Chia đa thức cho đơn thức đã sắp xếp

Thực hiện nhanh các phép chia:a) (a4 - 2a2b2 +b4) : (a2 + 2ab + b2);b) (-8a3 + 48a2b - 96ab2 + 64b3) : (a - 2b).

Toán Lớp 8
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Bài tập Toán 8: Chia đa thức cho đơn thức đã sắp xếp

Thực hiện nhanh các phép chia:a) (a2 - 6ab + 9b2) : (a - 3b);b) (a3 -9a2b + 27ab2 - 27b3) : (3b-a)2.

Toán Lớp 8
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Bài tập Toán 8: Chia đa thức cho đơn thức đã sắp xếp

Sử dụng hằng đẳng thức để thực hiện phép chia:a) (2x4 - 8x2 + 8): (4 - 2x2);b) (125 - 8x3):(4x - 10);c) (1 + 3x3 + 3x6 +x9):(-1 - x3).

Toán Lớp 8
Xem chi tiết 1.9 K lượt xem 2 năm trước
Bài tập Toán 8: Chia đa thức cho đơn thức đã sắp xếp

Sử dụng hằng đẳng thức để thực hiện phép chia:a) (x2 - 2x + l) :(x - 1);b) (8x3 +27): (2x + 3);c) (x6 - 6x4 + 12x2 - 8): (2 - x2).

Toán Lớp 8
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Bài tập Toán 8: Chia đa thức cho đơn thức đã sắp xếp

Phân tích thành nhân tử rồi thực hiện phép chiaa) (-8x5 + x3 - 2x2): 2x2;b) (14x6 - 21x4 - 35x2): (-7x2).

Toán Lớp 8
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Bài tập Toán 8: Chia đa thức cho đơn thức đã sắp xếp

Phân tích thành nhân tử rồi thực hiện phép chia:a) (24x5 - 9x3 + 18x2): 3x;b) (-5x4-12x3 - 13x2) : (-2x2).

Toán Lớp 8
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Bài tập Toán 8: Chia đa thức cho đơn thức đã sắp xếp

Thực hiện phép chia:a) (4x3 - 3x2 +1): (x2 + 2x -1);b) (2x4 - 11x3 + 19x2 - 20x + 9): (x2 - 4x +1).

Toán Lớp 8
Xem chi tiết 5.4 K lượt xem 2 năm trước
Bài tập Toán 8: Chia đa thức cho đơn thức đã sắp xếp

Thực hiện phép chia:a) (3x3 + 10x2 - 5): (3x +1);b) (x3 - 4x + 7): (x2 - 2x +1)

Toán Lớp 8
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Bài tập Toán 8: Chia đa thức cho đơn thức đã sắp xếp

Sắp xếp các đa thức theo luỹ thừa giảm dần của biến rồi tính:a) (-x2 + 6x3 - 26x + 21): (3 - 2x);b) (2x4 - 13x3 -15 + 5x + 21x2): (4x - x2 - 3).

Toán Lớp 8
Xem chi tiết 2.7 K lượt xem 2 năm trước
Bài tập Toán 8: Chia đa thức cho đơn thức đã sắp xếp

Sắp xếp các đa thức theo luỹ thừa giảm dần của biến rồi tính:a) (5x2 - 3x3 +15 - 9x): (5 - 3x);b) (-4x2 + x3 - 20 + 5x) : (x - 4).

Toán Lớp 8
Xem chi tiết 6.4 K lượt xem 2 năm trước
Bài tập Toán 8: Chia đa thức cho đơn thức đã sắp xếp

Thực hiện phép chia:a) (2x3 + 5x2 - 2x + 3) : (2x2 - x +1);b) (x5 + x3 + x2 +1) : (x3 +1).

Toán Lớp 8
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Bài tập Toán 8: Chia đa thức cho đơn thức đã sắp xếp

Thực hiện phép chia:a) (x3 - x2 - 5x - 3) : (x - 3);b) (x4+x3-6x2-5x + 5) : (x2+ x - 1).

Toán Lớp 8
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Bài tập

Cho hai tiếp tuyến tại A và B của đường tròn (O) cắt nhau tại M, biết AMB^=400a, Tính AMO^ và AOM^b, Tính số đo cung AB⏜ nhỏ và AB⏜ lớn

Toán Lớp 9
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Tổng hợp bộ đề thi thử THPTQG môn Tiếng Anh các năm Đề 39

When I _____ my suitcase back, I found that somebody _____ to open it.

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 656 lượt xem 5 năm trước
Tổng hợp bộ đề thi thử THPTQG môn Tiếng Anh các năm Đề 39

Children shouldn’t be allowed ____ time ____ computer games.

Tiếng Anh Tốt nghiệp THPT
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Tổng hợp bộ đề thi thử THPTQG môn Tiếng Anh các năm Đề 39

More tourists would come to this country if it ______ a better climate.

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 639 lượt xem 5 năm trước
Tổng hợp bộ đề thi thử THPTQG môn Tiếng Anh các năm Đề 39

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 from 3 to 9.        Most people can remember a phone number for up to thirty seconds. When this short amount of time elapses, however, the numbers are erased from the memory. How did the information get there in the first place? Information that makes its way to the short term memory (STM) does so via the sensory storage area. The brain has a filter which only allows stimuli that is of immediate interest to pass on to the STM, also known as the working memory.        There is much debate about the capacity and duration of the short term memory. The most accepted theory comes from George A. Miller, a cognitive psychologist who suggested that humans can remember approximately seven chunks of information. A chunk is defined as a meaningful unit of information, such as a word or name rather than just a letter or number. Modern theorists suggest that one can increase the capacity of the short term memory by chunking, or classifying similar information together. By organizing information, one can optimize the STM, and improve the chances of a memory being passed on to long term storage.        When making a conscious effort to memorize something, such as information for an exam, many people engage in "rote rehearsal". By repeating something over and over again, one is able to keep a memory alive. Unfortunately, this type of memory maintenance only succeeds if there are no interruptions. As soon as a person stops rehearsing the information, it has the tendency to disappear. When a pen and paper are not handy, people often attempt to remember a phone number by repeating it aloud. If the doorbell rings or the dog barks to come in before a person has the opportunity to make a phone call, he will likely forget the number instantly. Therefore, rote rehearsal is not an efficient way to pass information from the short term to long term memory. A better way is to practice "elaborate rehearsal". This involves assigning semantic meaning to a piece of information so that it can be filed along with other pre-existing long term memories.          Encoding information semantically also makes it more retrievable. Retrieving information can be done by recognition or recall. Humans can easily recall memories that are stored in the long term memory and used often; however, if a memory seems to be forgotten, it may eventually be retrieved by prompting. The more cues a person is given (such as pictures), the more likely a memory can be retrieved. This is why multiple choice tests are often used for subjects that require a lot of memorization.Which of the following is NOT supported by the passage?

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 833 lượt xem 5 năm trước
Tổng hợp bộ đề thi thử THPTQG môn Tiếng Anh các năm Đề 39

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 from 3 to 9.        Most people can remember a phone number for up to thirty seconds. When this short amount of time elapses, however, the numbers are erased from the memory. How did the information get there in the first place? Information that makes its way to the short term memory (STM) does so via the sensory storage area. The brain has a filter which only allows stimuli that is of immediate interest to pass on to the STM, also known as the working memory.        There is much debate about the capacity and duration of the short term memory. The most accepted theory comes from George A. Miller, a cognitive psychologist who suggested that humans can remember approximately seven chunks of information. A chunk is defined as a meaningful unit of information, such as a word or name rather than just a letter or number. Modern theorists suggest that one can increase the capacity of the short term memory by chunking, or classifying similar information together. By organizing information, one can optimize the STM, and improve the chances of a memory being passed on to long term storage.        When making a conscious effort to memorize something, such as information for an exam, many people engage in "rote rehearsal". By repeating something over and over again, one is able to keep a memory alive. Unfortunately, this type of memory maintenance only succeeds if there are no interruptions. As soon as a person stops rehearsing the information, it has the tendency to disappear. When a pen and paper are not handy, people often attempt to remember a phone number by repeating it aloud. If the doorbell rings or the dog barks to come in before a person has the opportunity to make a phone call, he will likely forget the number instantly. Therefore, rote rehearsal is not an efficient way to pass information from the short term to long term memory. A better way is to practice "elaborate rehearsal". This involves assigning semantic meaning to a piece of information so that it can be filed along with other pre-existing long term memories.          Encoding information semantically also makes it more retrievable. Retrieving information can be done by recognition or recall. Humans can easily recall memories that are stored in the long term memory and used often; however, if a memory seems to be forgotten, it may eventually be retrieved by prompting. The more cues a person is given (such as pictures), the more likely a memory can be retrieved. This is why multiple choice tests are often used for subjects that require a lot of memorization.The word “cues” in paragraph 4 is closest in meaning to ______.

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 737 lượt xem 5 năm trước
Tổng hợp bộ đề thi thử THPTQG môn Tiếng Anh các năm Đề 39

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 from 3 to 9.        Most people can remember a phone number for up to thirty seconds. When this short amount of time elapses, however, the numbers are erased from the memory. How did the information get there in the first place? Information that makes its way to the short term memory (STM) does so via the sensory storage area. The brain has a filter which only allows stimuli that is of immediate interest to pass on to the STM, also known as the working memory.        There is much debate about the capacity and duration of the short term memory. The most accepted theory comes from George A. Miller, a cognitive psychologist who suggested that humans can remember approximately seven chunks of information. A chunk is defined as a meaningful unit of information, such as a word or name rather than just a letter or number. Modern theorists suggest that one can increase the capacity of the short term memory by chunking, or classifying similar information together. By organizing information, one can optimize the STM, and improve the chances of a memory being passed on to long term storage.        When making a conscious effort to memorize something, such as information for an exam, many people engage in "rote rehearsal". By repeating something over and over again, one is able to keep a memory alive. Unfortunately, this type of memory maintenance only succeeds if there are no interruptions. As soon as a person stops rehearsing the information, it has the tendency to disappear. When a pen and paper are not handy, people often attempt to remember a phone number by repeating it aloud. If the doorbell rings or the dog barks to come in before a person has the opportunity to make a phone call, he will likely forget the number instantly. Therefore, rote rehearsal is not an efficient way to pass information from the short term to long term memory. A better way is to practice "elaborate rehearsal". This involves assigning semantic meaning to a piece of information so that it can be filed along with other pre-existing long term memories.          Encoding information semantically also makes it more retrievable. Retrieving information can be done by recognition or recall. Humans can easily recall memories that are stored in the long term memory and used often; however, if a memory seems to be forgotten, it may eventually be retrieved by prompting. The more cues a person is given (such as pictures), the more likely a memory can be retrieved. This is why multiple choice tests are often used for subjects that require a lot of memorization.The word “This” in paragraph 3 most probably refers to ______.

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 795 lượt xem 5 năm trước
Tổng hợp bộ đề thi thử THPTQG môn Tiếng Anh các năm Đề 39

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 from 3 to 9.        Most people can remember a phone number for up to thirty seconds. When this short amount of time elapses, however, the numbers are erased from the memory. How did the information get there in the first place? Information that makes its way to the short term memory (STM) does so via the sensory storage area. The brain has a filter which only allows stimuli that is of immediate interest to pass on to the STM, also known as the working memory.        There is much debate about the capacity and duration of the short term memory. The most accepted theory comes from George A. Miller, a cognitive psychologist who suggested that humans can remember approximately seven chunks of information. A chunk is defined as a meaningful unit of information, such as a word or name rather than just a letter or number. Modern theorists suggest that one can increase the capacity of the short term memory by chunking, or classifying similar information together. By organizing information, one can optimize the STM, and improve the chances of a memory being passed on to long term storage.        When making a conscious effort to memorize something, such as information for an exam, many people engage in "rote rehearsal". By repeating something over and over again, one is able to keep a memory alive. Unfortunately, this type of memory maintenance only succeeds if there are no interruptions. As soon as a person stops rehearsing the information, it has the tendency to disappear. When a pen and paper are not handy, people often attempt to remember a phone number by repeating it aloud. If the doorbell rings or the dog barks to come in before a person has the opportunity to make a phone call, he will likely forget the number instantly. Therefore, rote rehearsal is not an efficient way to pass information from the short term to long term memory. A better way is to practice "elaborate rehearsal". This involves assigning semantic meaning to a piece of information so that it can be filed along with other pre-existing long term memories.          Encoding information semantically also makes it more retrievable. Retrieving information can be done by recognition or recall. Humans can easily recall memories that are stored in the long term memory and used often; however, if a memory seems to be forgotten, it may eventually be retrieved by prompting. The more cues a person is given (such as pictures), the more likely a memory can be retrieved. This is why multiple choice tests are often used for subjects that require a lot of memorization.Why does the author mention a dog's bark?

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 1 K lượt xem 5 năm trước
Tổng hợp bộ đề thi thử THPTQG môn Tiếng Anh các năm Đề 39

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 from 3 to 9.        Most people can remember a phone number for up to thirty seconds. When this short amount of time elapses, however, the numbers are erased from the memory. How did the information get there in the first place? Information that makes its way to the short term memory (STM) does so via the sensory storage area. The brain has a filter which only allows stimuli that is of immediate interest to pass on to the STM, also known as the working memory.        There is much debate about the capacity and duration of the short term memory. The most accepted theory comes from George A. Miller, a cognitive psychologist who suggested that humans can remember approximately seven chunks of information. A chunk is defined as a meaningful unit of information, such as a word or name rather than just a letter or number. Modern theorists suggest that one can increase the capacity of the short term memory by chunking, or classifying similar information together. By organizing information, one can optimize the STM, and improve the chances of a memory being passed on to long term storage.        When making a conscious effort to memorize something, such as information for an exam, many people engage in "rote rehearsal". By repeating something over and over again, one is able to keep a memory alive. Unfortunately, this type of memory maintenance only succeeds if there are no interruptions. As soon as a person stops rehearsing the information, it has the tendency to disappear. When a pen and paper are not handy, people often attempt to remember a phone number by repeating it aloud. If the doorbell rings or the dog barks to come in before a person has the opportunity to make a phone call, he will likely forget the number instantly. Therefore, rote rehearsal is not an efficient way to pass information from the short term to long term memory. A better way is to practice "elaborate rehearsal". This involves assigning semantic meaning to a piece of information so that it can be filed along with other pre-existing long term memories.          Encoding information semantically also makes it more retrievable. Retrieving information can be done by recognition or recall. Humans can easily recall memories that are stored in the long term memory and used often; however, if a memory seems to be forgotten, it may eventually be retrieved by prompting. The more cues a person is given (such as pictures), the more likely a memory can be retrieved. This is why multiple choice tests are often used for subjects that require a lot of memorization.All of the following are mentioned as places in which memories are stored EXCEPT______.

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 767 lượt xem 5 năm trước
Tổng hợp bộ đề thi thử THPTQG môn Tiếng Anh các năm Đề 39

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 from 3 to 9.        Most people can remember a phone number for up to thirty seconds. When this short amount of time elapses, however, the numbers are erased from the memory. How did the information get there in the first place? Information that makes its way to the short term memory (STM) does so via the sensory storage area. The brain has a filter which only allows stimuli that is of immediate interest to pass on to the STM, also known as the working memory.        There is much debate about the capacity and duration of the short term memory. The most accepted theory comes from George A. Miller, a cognitive psychologist who suggested that humans can remember approximately seven chunks of information. A chunk is defined as a meaningful unit of information, such as a word or name rather than just a letter or number. Modern theorists suggest that one can increase the capacity of the short term memory by chunking, or classifying similar information together. By organizing information, one can optimize the STM, and improve the chances of a memory being passed on to long term storage.        When making a conscious effort to memorize something, such as information for an exam, many people engage in "rote rehearsal". By repeating something over and over again, one is able to keep a memory alive. Unfortunately, this type of memory maintenance only succeeds if there are no interruptions. As soon as a person stops rehearsing the information, it has the tendency to disappear. When a pen and paper are not handy, people often attempt to remember a phone number by repeating it aloud. If the doorbell rings or the dog barks to come in before a person has the opportunity to make a phone call, he will likely forget the number instantly. Therefore, rote rehearsal is not an efficient way to pass information from the short term to long term memory. A better way is to practice "elaborate rehearsal". This involves assigning semantic meaning to a piece of information so that it can be filed along with other pre-existing long term memories.          Encoding information semantically also makes it more retrievable. Retrieving information can be done by recognition or recall. Humans can easily recall memories that are stored in the long term memory and used often; however, if a memory seems to be forgotten, it may eventually be retrieved by prompting. The more cues a person is given (such as pictures), the more likely a memory can be retrieved. This is why multiple choice tests are often used for subjects that require a lot of memorization.The word “elapses” in paragraph 1 is closest in meaning to ______.

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 690 lượt xem 5 năm trước
Tổng hợp bộ đề thi thử THPTQG môn Tiếng Anh các năm Đề 39

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 from 3 to 9.        Most people can remember a phone number for up to thirty seconds. When this short amount of time elapses, however, the numbers are erased from the memory. How did the information get there in the first place? Information that makes its way to the short term memory (STM) does so via the sensory storage area. The brain has a filter which only allows stimuli that is of immediate interest to pass on to the STM, also known as the working memory.        There is much debate about the capacity and duration of the short term memory. The most accepted theory comes from George A. Miller, a cognitive psychologist who suggested that humans can remember approximately seven chunks of information. A chunk is defined as a meaningful unit of information, such as a word or name rather than just a letter or number. Modern theorists suggest that one can increase the capacity of the short term memory by chunking, or classifying similar information together. By organizing information, one can optimize the STM, and improve the chances of a memory being passed on to long term storage.        When making a conscious effort to memorize something, such as information for an exam, many people engage in "rote rehearsal". By repeating something over and over again, one is able to keep a memory alive. Unfortunately, this type of memory maintenance only succeeds if there are no interruptions. As soon as a person stops rehearsing the information, it has the tendency to disappear. When a pen and paper are not handy, people often attempt to remember a phone number by repeating it aloud. If the doorbell rings or the dog barks to come in before a person has the opportunity to make a phone call, he will likely forget the number instantly. Therefore, rote rehearsal is not an efficient way to pass information from the short term to long term memory. A better way is to practice "elaborate rehearsal". This involves assigning semantic meaning to a piece of information so that it can be filed along with other pre-existing long term memories.          Encoding information semantically also makes it more retrievable. Retrieving information can be done by recognition or recall. Humans can easily recall memories that are stored in the long term memory and used often; however, if a memory seems to be forgotten, it may eventually be retrieved by prompting. The more cues a person is given (such as pictures), the more likely a memory can be retrieved. This is why multiple choice tests are often used for subjects that require a lot of memorization.According to the passage, how do memories get transferred to the STM?

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 773 lượt xem 5 năm trước
Tổng hợp bộ đề thi thử THPTQG môn Tiếng Anh các năm Đề 39

Mark the letter A, B, C or D on your answer sheet to indicate the sentence that best completes each of the following exchanges from 1 to 2. Mary and her friend, Ensoleill, are in a coffee shop. Mary: “Would you like Matcha ice–cream or Caramen with jam?” Ensoleill: “______________”.

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 2.3 K lượt xem 1 năm trước
Tổng hợp bộ đề thi thử THPTQG môn Tiếng Anh các năm Đề 39

Mark the letter A, B, C or D on your answer sheet to indicate the sentence that best completes each of the following exchanges from 1 to 2.Ensoleill and Sunny are talking about Ted’s accident last week.Ensoleill: “A motor bike knocked Ted down”.                 Sunny: “ ____________”

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 6.8 K lượt xem 5 năm trước
Tổng hợp bộ đề thi thử THPTQG môn Tiếng Anh các năm Đề 38

Read the following passage and mark the letter A, B, C, or 0 on your answer sheet to indicate the correct answer to each of the questions from 43 to 50.Every summer, when the results of university entrance exam come out, many newspaper stories are published about students who are top-scorers across the country. Most portray students as hard-working, studious, smart and, generally, from low-income families. They are often considered heroes or heroines by their families, communes, villages and communities, And they symbolise the efforts made to lift them, and their relatives, out of poverty. The students are often too poor to attend any extra-classes, which make their achievements more illustrious and more newsworthy. While everyone should applaud the students for their admirable efforts, putting too much emphasis on success generates some difficult questions.If other students look up to them as models, of course it's great. However, in a way, it contributes to society's attitude that getting into university is the only way to succeed. For those who fail, their lives are over. It should be noted that about 1.3 million high school students take part in the annual university entrance exams and only about 300,000 of them pass. What's about the hundreds of thousands who fail? Should we demand more stories about those who fail the exam but succeed in life or about those who quit university education at some level and do something else unconventional?"I personally think that it's not about you scoring top in an entrance exam or get even into Harvard. It's about what you do for the rest of your life," said Tran Nguyen Le Van, 29. He is the founder of a website, vexere.com, that passengers can use to book bus tickets online and receive tickets via SMS. His business also arranges online tickets via mobile phones and email. Van dropped out of his MBA at the Thunderbird School of Global Management in Arizona in the United States. His story has caught the attention of many newspapers and he believes more coverage should be given to the youngsters who can be role-models in the start-up community. Getting into university, even with honours, is just the beginning. We applaud them and their efforts and obviously that can give them motivation to do better in life. However, success requires more than just scores," Van said. Van once told a newspaper that his inspiration also came from among the world's most famous drop-outs, such as Mark Zuckerberg of Facebook or Bill Gates who also dropped out of Harvard University.Alarming statistics about unemployment continues to plague us. As many as 162,000 people with some kind of degree cannot find work, according to Labour Ministry's statistics this month. An emphasis on getting into university does not inspire students who want to try alternative options. At the same time, the Ministry of Education and Training is still pondering on how to reform our exam system, which emphasises theories, but offers little to develop critical thinking or practice. Vu Thi Phuong Anh, former head of the Centre for Education Testing and Quality Assessment at Vietnam National University in Ho Chi Minh City said the media should also monitor student successes after graduation. She agreed there were many success stories about young people, but added that it was imbalanced if students taking unconventional paths were not also encouraged.Vietnam is, more than ever, in desperate need of those who think outside the box. Time for us to recognise talent, no matter where it comes from or how.What can be inferred from the passage?

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 873 lượt xem 5 năm trước
Bài tập Toán 8: Chia đa thức cho đơn thức

Tìm số tự nhiên n để đa thức A chia hết cho đơn thức B:a) A = -13x17y2n-3 +22x16y7; B = -7x3n+1y6;b) A = 20x5y2n - 10x4y3n + 15x5y6; B = 3x2yn+1.

Toán Lớp 8
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Tổng hợp bộ đề thi thử THPTQG môn Tiếng Anh các năm Đề 38

Read the following passage and mark the letter A, B, C, or 0 on your answer sheet to indicate the correct answer to each of the questions from 43 to 50.Every summer, when the results of university entrance exam come out, many newspaper stories are published about students who are top-scorers across the country. Most portray students as hard-working, studious, smart and, generally, from low-income families. They are often considered heroes or heroines by their families, communes, villages and communities, And they symbolise the efforts made to lift them, and their relatives, out of poverty. The students are often too poor to attend any extra-classes, which make their achievements more illustrious and more newsworthy. While everyone should applaud the students for their admirable efforts, putting too much emphasis on success generates some difficult questions.If other students look up to them as models, of course it's great. However, in a way, it contributes to society's attitude that getting into university is the only way to succeed. For those who fail, their lives are over. It should be noted that about 1.3 million high school students take part in the annual university entrance exams and only about 300,000 of them pass. What's about the hundreds of thousands who fail? Should we demand more stories about those who fail the exam but succeed in life or about those who quit university education at some level and do something else unconventional?"I personally think that it's not about you scoring top in an entrance exam or get even into Harvard. It's about what you do for the rest of your life," said Tran Nguyen Le Van, 29. He is the founder of a website, vexere.com, that passengers can use to book bus tickets online and receive tickets via SMS. His business also arranges online tickets via mobile phones and email. Van dropped out of his MBA at the Thunderbird School of Global Management in Arizona in the United States. His story has caught the attention of many newspapers and he believes more coverage should be given to the youngsters who can be role-models in the start-up community. Getting into university, even with honours, is just the beginning. We applaud them and their efforts and obviously that can give them motivation to do better in life. However, success requires more than just scores," Van said. Van once told a newspaper that his inspiration also came from among the world's most famous drop-outs, such as Mark Zuckerberg of Facebook or Bill Gates who also dropped out of Harvard University.Alarming statistics about unemployment continues to plague us. As many as 162,000 people with some kind of degree cannot find work, according to Labour Ministry's statistics this month. An emphasis on getting into university does not inspire students who want to try alternative options. At the same time, the Ministry of Education and Training is still pondering on how to reform our exam system, which emphasises theories, but offers little to develop critical thinking or practice. Vu Thi Phuong Anh, former head of the Centre for Education Testing and Quality Assessment at Vietnam National University in Ho Chi Minh City said the media should also monitor student successes after graduation. She agreed there were many success stories about young people, but added that it was imbalanced if students taking unconventional paths were not also encouraged.Vietnam is, more than ever, in desperate need of those who think outside the box. Time for us to recognise talent, no matter where it comes from or how.According to the fourth paragraph, what is TRUE about the modern exam system?

Tiếng Anh Tốt nghiệp THPT
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Tổng hợp bộ đề thi thử THPTQG môn Tiếng Anh các năm Đề 38

Read the following passage and mark the letter A, B, C, or 0 on your answer sheet to indicate the correct answer to each of the questions from 43 to 50.Every summer, when the results of university entrance exam come out, many newspaper stories are published about students who are top-scorers across the country. Most portray students as hard-working, studious, smart and, generally, from low-income families. They are often considered heroes or heroines by their families, communes, villages and communities, And they symbolise the efforts made to lift them, and their relatives, out of poverty. The students are often too poor to attend any extra-classes, which make their achievements more illustrious and more newsworthy. While everyone should applaud the students for their admirable efforts, putting too much emphasis on success generates some difficult questions.If other students look up to them as models, of course it's great. However, in a way, it contributes to society's attitude that getting into university is the only way to succeed. For those who fail, their lives are over. It should be noted that about 1.3 million high school students take part in the annual university entrance exams and only about 300,000 of them pass. What's about the hundreds of thousands who fail? Should we demand more stories about those who fail the exam but succeed in life or about those who quit university education at some level and do something else unconventional?"I personally think that it's not about you scoring top in an entrance exam or get even into Harvard. It's about what you do for the rest of your life," said Tran Nguyen Le Van, 29. He is the founder of a website, vexere.com, that passengers can use to book bus tickets online and receive tickets via SMS. His business also arranges online tickets via mobile phones and email. Van dropped out of his MBA at the Thunderbird School of Global Management in Arizona in the United States. His story has caught the attention of many newspapers and he believes more coverage should be given to the youngsters who can be role-models in the start-up community. Getting into university, even with honours, is just the beginning. We applaud them and their efforts and obviously that can give them motivation to do better in life. However, success requires more than just scores," Van said. Van once told a newspaper that his inspiration also came from among the world's most famous drop-outs, such as Mark Zuckerberg of Facebook or Bill Gates who also dropped out of Harvard University.Alarming statistics about unemployment continues to plague us. As many as 162,000 people with some kind of degree cannot find work, according to Labour Ministry's statistics this month. An emphasis on getting into university does not inspire students who want to try alternative options. At the same time, the Ministry of Education and Training is still pondering on how to reform our exam system, which emphasises theories, but offers little to develop critical thinking or practice. Vu Thi Phuong Anh, former head of the Centre for Education Testing and Quality Assessment at Vietnam National University in Ho Chi Minh City said the media should also monitor student successes after graduation. She agreed there were many success stories about young people, but added that it was imbalanced if students taking unconventional paths were not also encouraged.Vietnam is, more than ever, in desperate need of those who think outside the box. Time for us to recognise talent, no matter where it comes from or how.The word "plague" in paragraph 4 is closest in meaning to________.

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 760 lượt xem 5 năm trước
Tổng hợp bộ đề thi thử THPTQG môn Tiếng Anh các năm Đề 38

Read the following passage and mark the letter A, B, C, or 0 on your answer sheet to indicate the correct answer to each of the questions from 43 to 50.Every summer, when the results of university entrance exam come out, many newspaper stories are published about students who are top-scorers across the country. Most portray students as hard-working, studious, smart and, generally, from low-income families. They are often considered heroes or heroines by their families, communes, villages and communities, And they symbolise the efforts made to lift them, and their relatives, out of poverty. The students are often too poor to attend any extra-classes, which make their achievements more illustrious and more newsworthy. While everyone should applaud the students for their admirable efforts, putting too much emphasis on success generates some difficult questions.If other students look up to them as models, of course it's great. However, in a way, it contributes to society's attitude that getting into university is the only way to succeed. For those who fail, their lives are over. It should be noted that about 1.3 million high school students take part in the annual university entrance exams and only about 300,000 of them pass. What's about the hundreds of thousands who fail? Should we demand more stories about those who fail the exam but succeed in life or about those who quit university education at some level and do something else unconventional?"I personally think that it's not about you scoring top in an entrance exam or get even into Harvard. It's about what you do for the rest of your life," said Tran Nguyen Le Van, 29. He is the founder of a website, vexere.com, that passengers can use to book bus tickets online and receive tickets via SMS. His business also arranges online tickets via mobile phones and email. Van dropped out of his MBA at the Thunderbird School of Global Management in Arizona in the United States. His story has caught the attention of many newspapers and he believes more coverage should be given to the youngsters who can be role-models in the start-up community. Getting into university, even with honours, is just the beginning. We applaud them and their efforts and obviously that can give them motivation to do better in life. However, success requires more than just scores," Van said. Van once told a newspaper that his inspiration also came from among the world's most famous drop-outs, such as Mark Zuckerberg of Facebook or Bill Gates who also dropped out of Harvard University.Alarming statistics about unemployment continues to plague us. As many as 162,000 people with some kind of degree cannot find work, according to Labour Ministry's statistics this month. An emphasis on getting into university does not inspire students who want to try alternative options. At the same time, the Ministry of Education and Training is still pondering on how to reform our exam system, which emphasises theories, but offers little to develop critical thinking or practice. Vu Thi Phuong Anh, former head of the Centre for Education Testing and Quality Assessment at Vietnam National University in Ho Chi Minh City said the media should also monitor student successes after graduation. She agreed there were many success stories about young people, but added that it was imbalanced if students taking unconventional paths were not also encouraged.Vietnam is, more than ever, in desperate need of those who think outside the box. Time for us to recognise talent, no matter where it comes from or how.The word "them" in paragraph 3 refers to__________.

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 0.9 K lượt xem 5 năm trước

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