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数学
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x的3次方-y的3次方的因式分解
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人气:228 ℃ 时间:2019-09-27 16:22:57
解答
x³-y³
=x³-x²y+x²y-xy²+xy²-y³
=x²(x-y)+xy(x-y)+y²(x-y)
=(x-y)(x²+xy+y²)
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