推导公式:(x+y)(x²-xy+y²)=x³+y³

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推导公式:(x+y)(x²-xy+y²)=x³+y³
推导公式:(x+y)(x²-xy+y²)=x³+y³

推导公式:(x+y)(x²-xy+y²)=x³+y³
(x+y)(x²-xy+y²)
=x³-x²y+xy²+x²y-xy²+y³
=x³+(x²y-x²y)+(xy²-xy²)+y³
=x³+0+0+y³
=x³+y³