Mathematical reflection 2/2007

[DanDumitrescu]

$\dfrac{a}{b(b+c)^2}+\dfrac{b}{c(c+a)^2}+\dfrac{c}{a(a+b)^2}\ge\dfrac{9}{4(ab+bc+ac)};\,(\forall)a,b,c>0.$

[math111]

http://artofproblemsolving.com/communit ... inequality