$ x\left ( x-y \right )=\dfrac{3}{10};y\left ( x-y \right )=\dfrac{-3}{50}\\
=> x\left ( x-y \right ) : y\left ( x-y \right )= \dfrac{3}{10} : \dfrac{-3}{50}\\
=> \dfrac x y= -5\\
=> x=-5.y$
Thay vô $y( -5y-y )=\dfrac{-3}{50}\\
=>y.-6y=\dfrac{-3}{50}\\
=> y= \dfrac{1}{10}$
hoặc
y=−101
Tính x