(-1) +2+ (-3) +4 +(-5)+ 6+ (-7)+… +2012

来源：学生作业帮助网编辑：作业帮时间：2024/05/16 12:59:41

(-1) +2+ (-3) +4 +(-5)+ 6+ (-7)+… +2012
(-1) +2+ (-3) +4 +(-5)+ 6+ (-7)+… +2012

(-1) +2+ (-3) +4 +(-5)+ 6+ (-7)+… +2012
2012/2*1=1006

1 2 3 4 1 2 3 4 1 2 3 4 1,2,3,4, 1 2 3 4 1 2 3 4 1,2,3,4, 1,2,3,4, 1,2,3,4, 1,2,3,4, 1 2 3 4 1,2,3,4, 1,2,3,4, 1,2,3,4, 1、2、3、4 1+2+3×4 1,2,3,4 1+2+3+4+.