Find the max. of (|x+2y-3z|+|2y-u|+|x+2u|)/( |x-y|+ |x+2y+z|+|z+u|+|x-2u| )
where x,y,z,u are any real numbers and (x,y,z,u)≠(0,0,0,0).
試求(|x+2y-3z|+|2y-u|+|x+2u|)/( |x-y|+ |x+2y+z|+|z+u|+|x-2u| )的最大值, 其中
(x,y,z,u)≠(0,0,0,0).
Max. value(3)
2011-11-30 7:54 am
回答 (2)
2011-12-03 7:21 pm
2011-12-02 10:25 pm
請參考一下: 31/5
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https://hk.answers.yahoo.com/question/index?qid=20111129000051KK00996