计算:(3-a²)/(a²+2a+1)+(1-(1)/(a+1))÷(1+(1)/(a-1))
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计算:(3-a²)/(a²+2a+1)+(1-(1)/(a+1))÷(1+(1)/(a-1))
原式=[-(a²-3)/(a+1)²+(a-a-1)/(a+1)]÷(a-1+1)/(a-1)
=[-(a²-3)/(a+1)²-1/(a+1)]÷a/(a-1)
=-(a²-3+a+1)/(a+1)²×(a-1)/a
=-(a+2)(a-1)/(a+1)²×(a-1)/a
=-(a+2)(a-1)²/a(a+1)²
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再答: 做了
=[-(a²-3)/(a+1)²-1/(a+1)]÷a/(a-1)
=-(a²-3+a+1)/(a+1)²×(a-1)/a
=-(a+2)(a-1)/(a+1)²×(a-1)/a
=-(a+2)(a-1)²/a(a+1)²
再问: http://zhidao.baidu.com/question/384023649.html?quesup2&oldq=1
再答: 做了
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