Question

\(\left(\frac{2x}{3}-3\right):\left(-10\right)=\frac{2}{5}\)

\(1,5x-2\frac{1}{3}x=1,5-\frac{2}{3}\)

Giup minh voi

 

Answer 1

a)        \(\left(\frac{2x}{3}-3\right):\left(-10\right)=\frac{2}{5}\)

   <=>   \(\frac{2x}{3}-3=\frac{2}{5}.\left(-10\right)\)

   <=>   \(\frac{2x}{3}-3=-4\)

   <=>    \(\frac{2x}{3}=-4+3=-1\)

   <=>     \(2x=-1.3=-3\)

   <=> \(x=\frac{-3}{2}\)

Vậy \(x=\frac{-3}{2}\)

b) \(1,5x-2\frac{1}{3}x=1,5-\frac{2}{3}\)

\(x.\left(1,5-2\frac{1}{3}\right)=\frac{5}{6}\)

\(x.\left(\frac{-5}{6}\right)=\frac{5}{6}\)

\(x=\frac{5}{6}:\left(\frac{-5}{6}\right)=\frac{5}{6}.\left(\frac{-6}{5}\right)=-1\)

Vậy \(x=-1\)

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