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(x-y)(x²+xy+y²)解方程
人气:436 ℃ 时间:2020-01-28 09:56:34
解答
原式=x(x²+xy+y²)-y(x²+xy+y²)
=x³+x²y+xy²-x²y-xy²-y³
=x³-y³
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