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[(x^2+x-1)/(x-1)-1]/[x/(x^2-1)]
人气:129 ℃ 时间:2020-09-27 09:05:43
解答
[(x^2+x-1)/(x-1)-1]/[x/(x^2-1)]=x^2/(x-1)*(x^2-1)/x =x(x+1) =x^2+x
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