Question

[vuthihuonggiang]

tim y biet:y x 3/5 + y x  2/7=31/70

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Answer 1

[Thái Viết Nam]

\(y\times\frac{3}{5}+y\times\frac{2}{7}=\frac{31}{70}\)

\(y\times\left(\frac{3}{5}+\frac{2}{7}\right)=\frac{31}{70}\)

\(y\times\frac{31}{35}=\frac{31}{70}\)

\(y=\frac{31}{70}:\frac{31}{35}\)

\(y=\frac{31\times35}{70\times31}\)

\(y=\frac{35}{70}=\frac{1}{2}\)

Đáp số: \(y=\frac{1}{2}\)

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Answer 2

[tran thi phuong anh]

y x(3/5+2/7)=31/70

y x 31/35=31/70

y=31/70:31/35

y=1/2