1.proof 8^n-1 is divisible by 3
2.proof 1^2+3^2+......+(2n-1)=(n-(2n-1)(2n+1))/4
M.I quick !!!!!!!!!!!
2007-10-20 10:17 pm
回答 (1)
2007-10-20 10:37 pm
✔ 最佳答案
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2007-10-20 16:01:06 補充：
http://i187.photobucket.com/albums/x22/cshung/7007092303079.1.jpg
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