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计算a的2次方-1/a2次方+2a+1-a-1/1
人气:103 ℃ 时间:2020-06-12 20:54:39
解答
原式=(a-1)(a+1)/(a+1)²-(a-1)/1
=(a-1)/(a+1)-(a-1)/1
=(a-1)/(a+1-1)
=(a-1)/a
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