1997的2次方减1996乘1998分之1997等于多少
怎么写呀
人气：191 ℃ 时间：2019-10-19 17:24:39
解答
(1997^2-1996*1998)/1997
=(1997^2-(1997-1)*(1997+1))/1997
=1/1997.
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