Question

упростите (x-y)^2-(x-y)(x+y)/x^2y-xy^2

Answer 1

$frac{(x-y) ^{2}-(x-y)(x+y) }{ x^{2} y-xy ^{2} } = frac{(x-y)(x-y-x-y)}{xy(x-y)} = frac{-2}{x}$

Answer 2

можно объяснить, откуда взялось -2?