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把(x-y),(a+b)作为一个因式,合并同类项:3(x-y)-9(x-y)-8(x-y)+6(x-y)-1
人气:334 ℃ 时间:2019-09-27 06:53:46
解答
(1)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
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