(x+y)(x的平方-xy+y的平方)= 多少,与 (x-y)(x的平方+xy+y的平方)=多少

2024-11-17 09:52:25
推荐回答(1个)
回答1:

(x+y)(x²-xy+y²)
=x³-x²y+xy²+x²y-xy²+y³
=x³+y³
(x-y)(x²+xy+y²)
=x³+x²y+xy²-x²y-xy²-y³
=x³-y³