1.(a-b)^2-3(a-b)=

问题描述:

1.(a-b)^2-3(a-b)=
-2x^3y+4x^2y^2-xy^3
3.已知a-b=3,ab=1,求a^2b-ab^2的值

1、(a-b)(a-b-3)
2、xy(-2x*x+4xy-y*y)
3.a^2b-ab^2
=ab(a-b)
=1*3
=3
【希望采纳,谢谢】