MathDB
ineq

Source: Macedonian JBMO TST 2013

May 26, 2013
inequalitiesinequalities proposed

Problem Statement

a,b,c>0 a,b,c>0 and abc=1 abc=1 . Prove that 12 (a +b +c )+11+a +11+b +11+c 3\frac{1}{2}\ (\sqrt{a}\ +\sqrt{b}\ + \sqrt{c}\ ) +\frac{1}{1+a}\ + \frac{1}{1+b}\ + \frac{1}{1+c}\ge\ 3 . ( The official problem is with abc=1 abc = 1 but it can be proved without using it. )