Question

a^2(a-b)+2ab(a-b)+b^2(a-b) (x+y+1)^2-(x-y+1)^2

Answer 1

原题要求是因式分解吧：

a^2(a-b)+2ab(a-b)+b^2(a-b)

=(a-b) (a²+2ab+b²)

=(a-b)(a+b)²

(x+y+1)^2-(x-y+1)^2

=[(x+y+1)-(x-y+1)][(x+y+1)+(x-y+1)]

=2Y(2X+2)

=4Y(X+1)