(1996+1994+1992+……+6+4+2)-(1+3+5+……+1991+1993+1995)等于多少?
人气:239 ℃ 时间:2019-09-25 08:39:58
解答
原式=(1996-1995)+(1994-1993)+……+(2-1)(共有[(1995-1)/2+1]=998项
=998
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