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1除以a-1-2除以1-a平方
人气:105 ℃ 时间:2020-06-12 11:36:10
解答
原式=(a+1)/(a+1)(a-1)+2/(a²-1)
=(a+1)/(a+1)(a-1)+2/(a+1)(a-1)
=(a+1+2)/(a+1)(a-1)
=(a+3)/(a²-1)
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