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3(x-y)的2次方-9(x-y)-8(x-y)的2次方+6(x-y)-1合并同类项
人气:218 ℃ 时间:2019-08-22 11:59:18
解答
3(x-y)²-9(x-y)-8(x-y)²+6(x-y)-1
=(3-8)(x-y)²+(-9+6)(x-y)-1
=-5(x-y)²-3(x-y)-1
完毕
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