因式分解4-12(x-y)+9(x-y)的平方
人气：434 ℃ 时间：2020-03-29 13:32:14
解答
4-12(x-y)+9(x-y)²
=[2－3﹙x－y﹚]²
=﹙2－3x＋3y﹚²那个小的2是怎么弄的二次方，就是平方
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