因为(x+y)(x²-xy+y²)=x³-x²y+xy+x²y-xy²+y³=x³+y³(x-y)(x²+xy+y²)=x³+x²y+xy²-x²y-xy²-y³=x³-y³所以根据分解因式和整式乘法的互逆关
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