Question

Tìm x, y biết: x-y=2(x+y)=x:y

Answer 1

\(x-y=2\left(x+y\right)\)

\(x-y=2x+2y\)

\(-y-2b=2x-x\)

\(-3y=x\)\(\Rightarrow\frac{x}{y}=-3\)

Mặt khác \(x-y=x:y\)

                \(-3y-b=-3\)

                 \(-4y=-3\Rightarrow y=\frac{3}{4}\)

                  \(x=-3y=-3.\frac{3}{4}=\frac{-9}{4}\)

Vậy \(x=\frac{-9}{4}\), \(y=\frac{3}{4}\)