(x一y)(x^2+xy+y^2的过程多少

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(x一y)(x^2+xy+y^2的过程多少(x一y)(x^2+xy+y^2的过程多少(x一y)(x^2+xy+y^2的过程多少(x一y)(x^2+xy+y^2)=x(x^2+xy+y^2)-y(x^2

(x一y)(x^2+xy+y^2的过程多少
(x一y)(x^2+xy+y^2的过程多少

(x一y)(x^2+xy+y^2的过程多少
(x一y)(x^2+xy+y^2)=x(x^2+xy+y^2)-y(x^2+xy+y^2)=x^3+x^2y+xy^2-yx^2-xy^2-y^3=x^3-y^3

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