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a的平+2a+1分之3-a的平方+(1-(a+1分之1))除以(1+(a-1)分之1)
人气:147 ℃ 时间:2019-08-20 02:32:28
解答
=(3-a²)/(a+1)²+a/(a+1)÷a/(a-1)
=(3-a²)/(a+1)²+(a-1)/(a+1)
=(3-a²+a²-1)/(a+1)²
=2/(a²+2a+1)
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