Question

Упростить:
(x+y)²+(x-y)²-2x²

Answer 1

$x^{2} +2xy+ y^{2}+ x^{2} -2xy+ y^{2}-2 x^{2} =2 y^{2}$

Answer 2

(x-y)(x+y)+(x-y)(x+y)-2x^2= -2x^2 наверно так:D