(1- 1/4)(1- 1/9)(1- 1/16)(1- 1/25)(1- 1/36)......(1- 1/225)
我唔識計,唔該幫手
要式同step
但係唔好一大篇野或者純cop
收錄日期: 2021-04-13 14:45:35
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20071218000051KK02524