Cho $\left\{\begin{matrix} x\geq y\geq z\geq 1 & & \\ 2y+3z\geq 6& & \\ 11x+27y\geq 54& & \end{matrix}\right.$
Tìm Max:
$A=\frac{1}{x^2}+\frac{2008}{y^2}+\frac{2009}{z^2}$
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