Câu hỏi:

12/07/2025 12

Tính:

a) \(\frac{1}{3} + \frac{5}{2} - \frac{1}{4}\)

= …………………

b)\(\frac{1}{2} \times \frac{5}{7}:\frac{1}{3}\)

= …………………

 

= …………………

 

= ………………

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Trả lời:

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Giải bởi Vietjack

Lời giải

a) \(\frac{1}{3} + \frac{5}{2} - \frac{1}{4} = \frac{4}{{12}} + \frac{{30}}{{12}} - \frac{3}{{12}}\)

                       \( = \frac{{4 + 30 - 3}}{{12}} = \frac{{31}}{{12}}\)

b)\(\frac{1}{2} \times \frac{5}{7}:\frac{1}{3} = \frac{1}{2} \times \frac{5}{7} \times \frac{3}{1}\)

                 \( = \frac{{1 \times 5 \times 3}}{{2 \times 7 \times 1}} = \frac{{15}}{{14}}\)

CÂU HỎI HOT CÙNG CHỦ ĐỀ

Lời giải

Lời giải

a) \(\frac{2}{3} + \frac{4}{5} = \frac{{10}}{{15}} + \frac{{12}}{{15}} = \frac{{22}}{{15}}\)

\(\frac{8}{7} + 9 = \frac{8}{7} + \frac{{63}}{7} = \frac{{71}}{7}\)

b) \(\frac{8}{5} - \frac{2}{3} = \frac{{24}}{{15}} - \frac{{10}}{{15}} = \frac{{14}}{{15}}\)

\(7 - \frac{3}{{10}} = \frac{{70}}{{10}} - \frac{3}{{10}} = \frac{{67}}{{10}}\)

Lời giải

Lời giải

\(\frac{7}{4} \times \frac{5}{8} = \frac{{7 \times 5}}{{4 \times 8}} = \frac{{35}}{{32}}\)

\(\frac{{10}}{9}:\frac{3}{4} = \frac{{10}}{9} \times \frac{4}{3} = \frac{{10 \times 4}}{{9 \times 3}} = \frac{{40}}{{27}}\)

\(\frac{5}{7} \times 8 = \frac{5}{7} \times \frac{8}{1} = \frac{{5 \times 8}}{{7 \times 1}} = \frac{{40}}{7}\)

\(8:\frac{{15}}{7} = \frac{8}{1} \times \frac{7}{{15}} = \frac{{8 \times 7}}{{1 \times 15}} = \frac{{56}}{{15}}\)