olymmath

OMM 2009 Problem 3

    Sean aa, bb, cc números reales positivos tales que abc=1abc = 1. Muestra que

    a3a3+2+b3b3+2+c3c3+2≥1 y que 1a3+2+1b3+2+1c3+2≤1.\frac{a^3}{a^3+2} + \frac{b^3}{b^3+2} + \frac{c^3}{c^3+2} \geq 1 \text{ y que } \frac{1}{a^3+2} + \frac{1}{b^3+2} + \frac{1}{c^3+2} \leq 1.

    Official text Mexican Mathematical Olympiad 2009 official paper, page 1. Quoted with source.

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