(-1)+(+2)+(-3)+(+4)+……+(-2005)+(+2006)+(-2007)+(+2008)

来源：学生作业帮助网编辑：作业帮时间：2024/07/14 19:56:03

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(-1)+(+2)+(-3)+(+4)+……+(-2005)+(+2006)+(-2007)+(+2008)
(-1)+(+2)+(-3)+(+4)+……+(-2005)+(+2006)+(-2007)+(+2008)

(-1)+(+2)+(-3)+(+4)+……+(-2005)+(+2006)+(-2007)+(+2008)
(-1)+(+2)+(-3)+(+4)+……+(-2005)+(+2006)+(-2007)+(+2008)
=(-1+2+3-4)+(-5+6+7-8)+……+(-2005+2006+2007-2008)
=0+0+……+0
=0

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+.