因式分解:x²-y²-x+y=________ 因式分解:(a-b)²+2(a-b)-3

问题描述:

因式分解:x²-y²-x+y=________ 因式分解:(a-b)²+2(a-b)-3

x²-y²-x+y=________
= ( x+y) (x-y) -(x-y)
= (x+y-1) (x-y)
(a-b)²+2(a-b)-3
= (a-b+3)( a-b-1)