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(x-y)的平方-(x-y)的3次方(用分解因式计算)
人气:463 ℃ 时间:2020-04-10 19:04:53
解答
(x-y)²-(x-y)³
=(x-y)²[1-(x-y)]
=(x-y)²(1-x+y)
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