先化简,再求值:(x-y)²(x²+xy+y²)-(x³+y³)(-x³+y³),其中X=1,Y=-1
问题描述:
先化简,再求值:(x-y)²(x²+xy+y²)-(x³+y³)(-x³+y³),其中X=1,Y=-1
答
(x-y)²(x²+xy+y²)-(x³+y³)(-x³+y³),其中X=1,Y=-1=(x-y)²(x²+xy+y²)+(x³+y³)(x-y)(x²+y²+xy)=(x-y)(x²+xy+y²)(x-y+x³+y³...