a,b,c是正實數且a+b+c=1.求証(1/a -1)(1/b -1)(1/c -1)>=8
1唔係分母~
收錄日期: 2021-04-23 23:23:02
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20110323000051KK01268