Question

[Nguyễn Thảo Chi]

tính 
 7/15+4/5       35/28-48/64            10/13:3/4

Answer 1

[Võ Ngọc Phương]

\(\dfrac{7}{15}+\dfrac{4}{5}\)

\(=\dfrac{7}{15}+\dfrac{12}{15}\)

\(=\dfrac{19}{15}\)

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\(\dfrac{35}{28}-\dfrac{48}{64}\)

\(=\dfrac{2240}{1792}-\dfrac{1344}{1792}\)

\(=\dfrac{896}{1792}=\dfrac{1}{2}\)

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\(\dfrac{10}{13}:\dfrac{3}{4}\)

\(=\dfrac{10}{13}\)x\(\dfrac{4}{3}\)

\(=\dfrac{40}{39}\)

Answer 2

[Lê Hoàng Như Mai]

19/15

1/2

40/39