Maths Challenge

2007-10-05 5:20 pm
Find Sn for 2+22+222+...

回答 (2)

2007-10-05 6:22 pm
參考: My Maths knowledge
2007-10-05 8:02 pm
唔好意思,由於等級關係未能貼圖,請按以下link
本人的方法是做2次GS sum
http://i109.photobucket.com/albums/n60/naozumilok/forum/2007-10-05_115131.jpg


收錄日期: 2021-04-13 19:30:41
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20071005000051KK00592

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