化简(2013a/a^2-2a+1)/(1+1/a-1)
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(2013a/a^2-2a+1)/(1+1/a-1) =2013a/(a-1)^2 / (a/a-1) =2013a/(a-1)^2 x (a-1)/a =2103/(a-1)
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