Question

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Answer 1

\(=\dfrac{7}{10}\times\left(3+5+2\right)=\dfrac{7}{10}\times10=7\)

Answer 2

3x 7/10 + 7/10 x 5+2 x 7/10

\(=\dfrac{7}{10}x\left(3+5+2\right)\)

\(=\dfrac{7}{10}x10\)

\(=7\)

Answer 3

sao mk ko nhìn thấy đề nhỉ ????

Answer 4

\(3\times\dfrac{7}{10}+\dfrac{7}{10}\times5+2\times\dfrac{7}{10}=\) 

\(=\dfrac{7}{10}\times3+\dfrac{7}{10}\times5+\dfrac{7}{10}\times2\)

\(=\dfrac{7}{10}\times\left(3+5+2\right)\) 

\(=\dfrac{7}{10}\times10\)

\(=7\)

Answer 5

Sao mình cũng hông thấy để nhỉ 

Answer 6

`7/10 xx (5+3+2) = 7/10 xx 10 = 7`.