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Daca a,b,c>0, a+b+c=3 si x[tex]\geq[/tex]0, aratati ca [tex]\frac{a^2}{a^3+xa+1} + \frac{b^2}{b^3+xb+1} + \frac{c^2}{c^3+xc+1} \leq \frac{3}{x+2}[/tex]