If a , b and c are three positf real numbers and :

Prove that :

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- May 20th 2010, 11:46 PMdhiabProve that
If a , b and c are three positf real numbers and :

Prove that : - May 21st 2010, 12:21 AMpickslides
??

- May 21st 2010, 12:47 AMaman_cc
- May 21st 2010, 05:48 AMroninpro
It may also help to scale the numbers so that and sharpen the lower bound to .