(+1)+(-2)+(+3)+...+(+99)+(-100
回答 (3)
2010-06-25 4:05 am
✔ 最佳答案
解：(+1)+(-2)+(+3)+...+(+99)+(-100)=[(+1)+(+3)+(+5)+...+(+99)]+[(-2)+(-4)+(-6)+...+(-100)]
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2010-06-25 4:04 am
(+1)+(-2)+(+3)+(-4)+...+(+99)+(-100)=??
A. (+1)+(-2)+(+3)+(-4)+...+(+99)+(-100)
= 1-2+3-4+...+99-100
= (-1)+(-1)+...+(-1)+(-1)---------因為共有100/2 = 50組
= 50*(-1)
= -50
A. (+1)+(-2)+(+3)+(-4)+...+(+99)+(-100)
= 1-2+3-4+...+99-100
= (-1)+(-1)+...+(-1)+(-1)---------因為共有100/2 = 50組
= 50*(-1)
= -50
參考: Myself
收錄日期: 2021-04-13 17:20:20
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20100624000051KK01287