
Code:
\[ \frac{f(x_{1})+f(x_{2})+f(x_{3})}{3}\ge f\left(\frac{x_{1}+x_{2}+x_{3}}{3}\right) \]

Code:
\[ \frac{f(x_{1})+f(x_{2})+f(x_{3})}{3}\ge f\left(\frac{x_{1}+x_{2}+x_{3}}{3}\right) \]
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