因式分解:x3+x2-y3-y2=

问题描述:

因式分解:x3+x2-y3-y2=

x3+x2-y3-y2
=x3-y3+x2-y2
=(x-y)(x2+xy+y2)+(x-y)(x+y)
=(x-y)(x+y+x2+xy+y2)为什么x3-y3=(x-y)(x2+xy+y2)??亲,这是立方差公式,不需要你证明的。你只要熟记就行了。