作业帮1+（-2）+3+（-4）···········+99-100等于多少
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1+（-2）+3+（-4）···········+99-100等于多少
1+（-2）+3+（-4）···········+99-100等于多少
1+（-2）+3+（-4）···········+99-100等于多少
1+（-2）=-1
3+（-4）=-1
.
共50对
所以原式的-1x50=-50
50
把1和-2结合，3和-4结合，以此类推，99和-100结合
最后得到1-乘50（因为每两组是-1，一共有100个数，所以100除以2有20组）
得到结果-50
两两结合，等于-50
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计算（+1）+(-2)+(+3)+(-4)+······+（-100）+(+101)+(-102)
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1+（-2）+3+（-4）···········+99-100等于多少
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