(-1)+(+2)+(-3)+(+4)```````+(-1999)+(+2000)

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(-1)+(+2)+(-3)+(+4)```````+(-1999)+(+2000)

(-1)+(+2)+(-3)+(+4)```````+(-1999)+(+2000)
(-1)+(+2)+(-3)+(+4)```````+(-1999)+(+2000)

(-1)+(+2)+(-3)+(+4)```````+(-1999)+(+2000)
答案：1000
2-1=1
4-3=1

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+.