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(a的平方-a)除以(a-1)分之a
人气:280 ℃ 时间:2019-12-06 10:57:03
解答
(a的平方-a)除以(a-1)分之a
=(a^2-a)/[a/(a-1)]
=(a^2-a)*(a-1)/a
=a(a-1)*(a-1)/a
=(a-1)^2
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