$ \dfrac{1}{a+b+1} +\dfrac{1}{b+c+1} + \dfrac{1}{c+a+1} \leq 1$
thanks các bác trước nha!
Edited by inhtoan, 21-06-2009 - 11:52.
Edited by inhtoan, 21-06-2009 - 11:52.
ừ bài nè dễ thui!cho abc=1. a,b,c> 0.CMR:
$ \dfrac{1}{a+b+1} +\dfrac{1}{b+c+1} + \dfrac{1}{c+a+1} \leq 1$
thanks các bác trước nha!
Edited by cvp, 21-06-2009 - 12:21.
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