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tienqm123

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\Leftrightarrow $ 6a^2 + 10ab + 6b^2 = 706 $
\Leftrightarrow $ 5(a+b)^2 + (a^2+b^2) = 706 $
\Rightarrow a^2 + b^2 \leq 706
\Rightarrow $ Max (a^2 + b^2) = 706 $
 
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