Question

(x-y)(y-x)=? Какой ответ?

Answer 1

Ответ:

(х-у)(у-х)= -х²+2ху-у²

Объяснение:

(х-у)(у-х)=

=(х-у)×(-(х-у))=

= -(х-у)²=

= -(х²-2ху+у²)=

= -х²+2ху-у²

Answer 2

Ответ:

$(x-y)(y-x)=(x-y)\cdot \Big(-(x-y)\Big)=-(x-y)(x-y)=\boxed{-(x-y)^2}=\\\\=\boxed{-x^2+2xy-y^2}$