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Binh nhất
Cho $f$ đi từ $\mathbb{R}$ đến $\mathbb{R}$ và thỏa:
$f(x+y)+f(y+z)+f(z+x) \geq f(x+2y+3z)$
Edited by namcpnh, 02-06-2013 - 11:34.
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