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化简 3(X-Y)²-4(X-Y)+7(X-Y)-6(X-Y)²
3(X-Y)²-4(X-Y)+7(X-Y)-6(X-Y)²
(X-Y)视为整体
人气：374 ℃　时间：2020-04-02 02:58:43
解答
3(X-Y)²-4(X-Y)+7(X-Y)-6(X-Y)²
=(3-6)(X-Y)²+(-4+7)(X-Y)
=-3(X-Y)²+3(X-Y)
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