無限項之和(循環小數)
1. 0.432
f.5一條無限項之和
2009-09-24 7:07 am
回答 (1)
2009-09-24 7:18 am
✔ 最佳答案
0.432432432.......
= 0.432 + 0.432 / 1000 + 0.432/1000^2 + 0.432/1000^3 +...
= 0.432 / (1 - 1/1000)
= 0.432 / (999/1000)
= 432 / 999
= 16/37
收錄日期: 2021-04-21 22:04:02
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20090923000051KK01962