Question 74
Let $a$, $b$, $c$ be positive real numbers. Prove the following inequality:
$$
\frac{a}{\sqrt{3 a+2 b+c}}+\frac{b}{\sqrt{3 b+2 c+a}}+\frac{c}{\sqrt{3 c+2 a+b}} \leq \frac{1}{\sqrt{2}} \sqrt{a+b+c}
$$
$$
\frac{a}{\sqrt{3 a+2 b+c}}+\frac{b}{\sqrt{3 b+2 c+a}}+\frac{c}{\sqrt{3 c+2 a+b}} \leq \frac{1}{\sqrt{2}} \sqrt{a+b+c}
$$