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数学
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计算(a三次方-a)/(a²+2a+1)
人气:231 ℃ 时间:2020-01-30 04:16:15
解答
(a三次方-a)/(a²+2a+1)
=a(a²-1)/(a+1)²
=a(a-1)(a+1)/(a+1)²
=a(a-1)/(a+1);
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