Question

Tìm x,y

x(x-y) = 3/10 và y(x-y) = -3/50

Answer 1

\(x\left(x-y\right)-y\left(x-y\right)=\frac{3}{10}+\frac{3}{50}=\frac{18}{50}=\frac{9}{25}\)

\(\Rightarrow\left(x-y\right)\left(x-y\right)=\frac{9}{25}\)

\(\Rightarrow\left(x-y\right)^2=\orbr{\begin{cases}\left(\frac{3}{5}\right)^2\\\left(-\frac{3}{5}\right)^2\end{cases}}\)

\(\Rightarrow x-y=\orbr{\begin{cases}\frac{3}{5}\\-\frac{3}{5}\end{cases}}\)