(x-y)(x²+xy+y²)解方程

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(x-y)(x²+xy+y²)解方程

(x-y)(x²+xy+y²)解方程
(x-y)(x²+xy+y²)解方程

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