點解1^2+2^2+3^2+...n^2=1/6 n(n+1)(2n+1)
唔要證明...係問人類點解知道1^2+2^2+3^2+...n^2=1/6 n(n+1)(2n+1)
點解1^2+2^2+3^2+...n^2=1/6 n(n+1)(2n+1)
2008-09-02 6:38 am
回答 (2)
2008-09-03 1:40 am
2008-09-02 8:01 am
收錄日期: 2021-04-16 23:26:47
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https://hk.answers.yahoo.com/question/index?qid=20080901000051KK02633