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数学
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计算或化简:[(2a+2)/(a-1)]÷(a+1)-[(a²-1)/(a²-2a+1)]
人气:434 ℃ 时间:2020-02-03 20:18:29
解答
原式=[2(a+1)/(a-1)×[1/(a+1)]-(a+1)(a-1)/(a-1)²
=2/(a-1)-(a+1)/(a-1)
=(2-a-1)/(a-1)
=-(a-1)/(a-1)
=-1
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