tìm min!

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C

conga222222

$\eqalign{
& \cos i: \cr
& x + {1 \over {y\left( {x - 8y} \right)}} = \left( {x - 8y} \right) + 8y + {1 \over {y\left( {x - 8y} \right)}} \ge 3\root 3 \of 8 = 6 \cr
& dau = \leftrightarrow x = 4;\;y = {1 \over 4} \cr} $
 
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