用简便方法计算:11+12-13-14+15+16-17-18+.+99+100
人气：142 ℃ 时间：2019-10-06 22:03:41
解答
11+12-13-14+15+16-17-18+.+99+100
=11+12+（-13-14+15+16)+(-17-18+19+20)+...+(-97-98+99+100)
=11+12+4*(100-12)/4
=11+12+88
=111
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