从1-2+3-4+5-6+...+2011-2012,可以把前后相邻的两个数看作一组,每组的得数是-1,共有2012÷2=1006组
1-2+3-4+5-6+...+2011-2012+2013
=2013-1X1006
=1007
计算1-2+3-4+5-6+...+2011-2012+2013
计算1-2+3-4+5-6+...+2011-2012+2013
数学人气:588 ℃时间:2019-11-19 02:37:34
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