Geometric sequence
回答 (1)
2009-02-21 10:26 pm
✔ 最佳答案
The common ratio of the positive terms is 1/4,the 1st term is 4,so the sum is 4/(1- 1/4)
= 16/3
收錄日期: 2021-04-21 22:01:17
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https://hk.answers.yahoo.com/question/index?qid=20090221000051KK00981