计算：(x-y)(x²+xy+y²)
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计算：(x-y)(x²+xy+y²)计算：(x-y)(x²+xy+y²)计算：(x-y)(x²+xy+y²)原式＝x⑶+x²y+x
计算：(x-y)(x²+xy+y²)
计算：(x-y)(x²+xy+y²)
计算：(x-y)(x²+xy+y²)
原式＝x⑶+x²y+xy²-x²y-xy²-y⑶
=x⑶-y⑶
=a的三次方减b的三次方
(x-y)(x²+xy+y²)=x3-y3
(x-y)(x²+xy+y²)=x^3-y^3