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6(x-y)³+15(y-x)²-9(y-x)³因式分解
人气：139 ℃　时间：2020-02-03 05:22:11
解答
=6(x-y)³-15(x-y)²+9(x-y)³
=15(x-y)³-15(x-y)²
=15(x-y)²(x-y-1)
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