Violympic toán 6

NL

\(2\cdot\left(\dfrac{3}{4}-5x\right)=\dfrac{4}{5}-3x\)

H24
6 tháng 7 2018 lúc 7:59

\(2.\left(\dfrac{3}{4}-5x\right)=\dfrac{4}{5}-3x\)

= \(2.\dfrac{3}{4}-2.5x=\dfrac{4}{5}-3x\)

= \(\dfrac{3}{2}-10x=\dfrac{4}{5}-3x\)

= \(\dfrac{3}{2}-\dfrac{4}{5}=10x-3x\)

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

\(\dfrac{7}{10}:7=x\)

\(\dfrac{1}{10}=x\)

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