B. \(\dfrac{2}{5}\) hộp bánh

D. Ai làm gì?

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

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

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

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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\(\dfrac{4}{3}\)

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

\(\dfrac{3}{5}\)x\(\dfrac{4}{7}:\dfrac{16}{21}\)

\(=\dfrac{12}{35}:\dfrac{16}{21}\)

\(=\dfrac{9}{20}\)

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\(\dfrac{2}{3}-x=\dfrac{2}{3}\)

       \(x=\dfrac{2}{3}-\dfrac{2}{3}\)

      \(x=0\)

Chúc bạn học tốt:>

Ta có: 

\(\dfrac{13}{10}=1,3;70\%=0,7;\dfrac{41}{10}=4,1\)

\(1,3+0,7+4,1+0,59=6,69\)

Chúc bạn học tốt:>

15 năm nữa

nice:)))))

\(\dfrac{3}{5}x\dfrac{2}{6}=\dfrac{6}{30}=\dfrac{1}{5}\)

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\(y:\dfrac{4}{7}=\dfrac{8}{9}\)

\(y=\dfrac{8}{9}x\dfrac{4}{7}\)

\(y=\dfrac{32}{63}\)

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thank you

How much is this book?

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tick chi mik