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

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(-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+.