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化简(a-a+1分之a)÷a²-4分之a²-2a×a²+3a+2分之a-1
人气:394 ℃ 时间:2019-09-05 16:19:21
解答
=(a²+a-a)/(a+1)×(a+2)(a-2)/a(a-2)×(a-1)/(a+1)(a-1)
=a²/(a+1)×(a+2)/a×1/(a+1)
=a(a+2)/(a+1)²
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