Maths: how to do (b), thanks?
回答 (2)
2020-02-12 10:42 pm
✔ 最佳答案
1/(n(n+1)) = ((n+1)-n))/(n(n+1)) = 1/n - 1/(n+1)so (b) = 1/1 - 1/2 + 1/2 - 1/3 + 1/3 - 1/4 + ... + 1/49 - 1/50 = 1 - 1/50 = 49/50
2020-02-13 7:37 am
我什麼都不知道，哥們已經發現了15個字母
收錄日期: 2021-04-24 07:52:08
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20200212142757AA5vYFg