(+1)+(-2)+(+3)+(-4)+.+(+99)+(-100)这道题怎么解

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(+1)+(-2)+(+3)+(-4)+.+(+99)+(-100)这道题怎么解
(+1)+(-2)+(+3)+(-4)+.+(+99)+(-100)这道题怎么解

(+1)+(-2)+(+3)+(-4)+.+(+99)+(-100)这道题怎么解
2个2个相加即是50个-1
答案是-50

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+.