maths........

👨🏻‍🏫 學術台數學

explorer

2008-09-06 3:01 am

Prove,by inducation,that for all positive integers n.

(n)(1)+(n-1)(2)+(n-2)(3)+...+(n -2)(3)+(n-1)(2)+(n)(1) =(1/6)(k)(k+1)(k+2)

回答 (3)

用戶7639

2008-09-07 3:20 pm

✔ 最佳答案

As followa AS~~~~

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Gabriella Montez

2008-09-06 5:02 am

http://hk.knowledge.yahoo.com/question/question?qid=7008050501024
Think twice before you answer this question.

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yau

2008-09-06 3:31 am

..............出錯題................
左邊n點等於右邊k?

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