1
$\text{max}\left
\{frac{1}{2}2x^{2}(2A+6Bx^{-4})+x(2Ax-2Bx^{-3}+\frac{1}{3
}-4(Ax^{2}+Bx^{-2}+\frac{1}
{3}x+1)+x+4,Ax^{2}+Bx^{-2}+\frac{1}{3}x-Ax^{2}-Bx^{-2}-\f
rac{1}{3}x-1路路路\right\}$
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