2x-2加上x-1分之5 分式加减,
人气:118 ℃ 时间:2020-05-13 14:49:55
解答
2x-2+5/(x-1)
=2(x-1)+5/(x-1)
=2(x-1)(x-1)/(x-1)+5/(x-1)
=(2x²-4x+2)/(x-1)+5/(x-1)
=(2x²-4x+2+5)/(x-1)
=(2x²-4x+7)/(x-1)
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