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MathNet 2023-part-04 — 191 problems (EN–VI) Question 96

Math Olympiad Vault · MathNet 2023-part-04 — 191 problems (EN–VI)

Question 96

Find the smallest possible value of
$$
x y + y z + z x + \frac{1}{x} + \frac{2}{y} + \frac{5}{z},
$$
for positive real numbers $x$, $y$ and $z$.