看圖~~~看圖~~~看圖~~~看圖~~~看圖~~~
圖片參考：http://i256.photobucket.com/albums/hh182/zilu_photo/sshot-2010-02-21-16-33-17.png
inequality1
2010-02-22 12:35 am
回答 (1)
2010-02-22 2:42 am
✔ 最佳答案
0 <=(ai-aj)*(bi-bj)= ai*bi+aj*bj-(ai*bj+aj*bi)so, ai*bi+aj*bj>= ai*bj+aj*bi
thus, Σ ai*b(n-1+i) <= Σ ai*bi
收錄日期: 2021-04-30 14:23:34
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20100221000051KK01071