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MathNet 2019-part-06 — 184 problems (EN–VI) Question 42

Math Olympiad Vault · MathNet 2019-part-06 — 184 problems (EN–VI)

Question 42

Let $a$, $b$, $c \geq 0$ satisfy $a + b + c = 1$. Prove that
$$
\frac{\sqrt{a}}{b + 1} + \frac{\sqrt{b}}{c + 1} + \frac{\sqrt{c}}{a + 1} \gt \frac{1}{2}(\sqrt{a} + \sqrt{b} + \sqrt{c}) .
$$