1+(-2)+3+(-4)+... ...2009+(-2010)+2011等于多少
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1+(-2)+3+(-4)+... ...2009+(-2010)+2011等于多少
![1+(-2)+3+(-4)+... ...2009+(-2010)+2011等于多少](/uploads/image/z/15219523-19-3.jpg?t=1%EF%BC%8B%EF%BC%88-2%EF%BC%89%EF%BC%8B3%EF%BC%8B%EF%BC%88-4%EF%BC%89%EF%BC%8B...+...2009%EF%BC%8B%EF%BC%88-2010%EF%BC%89%EF%BC%8B2011%E7%AD%89%E4%BA%8E%E5%A4%9A%E5%B0%91)
1+(-2)+3+(-4)+......+2009+(-2010)+2011
=【1+(-2)】+【3+(-4)】+......+【2009+(-2010)】+2011
=-1-1-……-1+2011
=-1005+2011
=1006
=【1+(-2)】+【3+(-4)】+......+【2009+(-2010)】+2011
=-1-1-……-1+2011
=-1005+2011
=1006