R
rua_con_277


a) Voi x, y>0
CM: x^3/(x^2+xy+y^2)>= (2x-y)/3
b) co a, b, c >0
a^3/(a^2+b^2+ab)+b^3/(b^2+c^2+bc)+c^3/(c^2+b^2+ac)>= (a+b+c)/2
lam dc minh thanks luon ^_^
CM: x^3/(x^2+xy+y^2)>= (2x-y)/3
b) co a, b, c >0
a^3/(a^2+b^2+ab)+b^3/(b^2+c^2+bc)+c^3/(c^2+b^2+ac)>= (a+b+c)/2
lam dc minh thanks luon ^_^
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