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简便计算1997²-1996×1998分之1997
人气:102 ℃ 时间:2020-04-03 19:49:34
解答
令a=1997
则原式=a/[a²-(a-1)(a+1)]
=a/[a²-(a²-1)]
=a/(a²-a²+1)
=a
=1997
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