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(a-1)/(a-2)乘(2a-4)/(a的平方-3a+2)
人气:345 ℃ 时间:2020-01-11 03:10:20
解答
原式=(a-1)/(a-2)×2(a-2)/(a-1)(a-2)
=(a-1)/(a-2)×2/(a-1)
=2/(a-2)
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