Question

Упростите выражение (-1-xy)^2+(x-y-1)^2-(xy+1)^2


^2 значит во второй степени

Answer 1

Ответ:

(-(xy+1))²+(x-y-1)²-(xy+1)²

(xy+1)²+(x-y-1)²-(xy+1)²

x²+y²+1-2xy-2x+2y

Answer 2

$(-1-xy)^2+(x-y-1)^2-(xy+1)^2=(x-y-1)^2-(xy+1)^2+(xy+1)^2=(x-y-1)^2$