Question

Rút gọn biểu thức x(x-y)-y(y-x) ta được

Answer 1

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

Answer 2

x(x-y)-y(y-x) = x²-xy-(y²-xy) = x²-xy-y²+xy = x²-y²

Answer 3

x(x-y)-y(y-x) = x²-xy-(y²-xy) = x²-xy-y²+xy = x²-y²

^{Tham thảo}