Question

решите пожалуйста                  x-y-x^2+2xy-y^2

Answer 1

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

Answer 2

(2-x) (2+x)-a (a-2x)

Answer 3

плиз реши