Help with this question.?
回答 (3)
2008-02-04 3:21 am
✔ 最佳答案
1 + 2 + 3 + 4 + ... ... + 98 + 99= (1 + 99) x 99 ÷ 2
= 100 x 99 ÷ 2
= 9900 ÷ 2
= 4950
(first term + last term) x total terms ÷ 2
2008-02-04 11:22 am
4950
2008-02-04 11:19 am
99*100/2
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收錄日期: 2021-05-01 09:55:21
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20080203191453AAvjTwT