Prove , by mathematical induction , that
1^2-2^2+3^2-4^2+......+(2n-1)^2-(2n)^2 = -n(2n+1)for all positive integer n .
Hence , find the value of
1x2-2x3+3x4-....+49x50
朋友, 你們有什麼方法去計M.I的呢??WHY我次次做到n=k+1 的時候都計唔到ge
It too difficult !!!!!! teach me how to do . (little bit afraid of CE....) 死啦!!!
M.I question
2007-10-19 6:36 am
回答 (1)
2007-10-19 6:51 am
✔ 最佳答案
As follows~~~圖片參考：http://i182.photobucket.com/albums/x4/A_Hepburn_1990/MI30.jpg?t=1192719072
參考: Myself~~~
收錄日期: 2021-04-13 20:01:20
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https://hk.answers.yahoo.com/question/index?qid=20071018000051KK03978