[tex]\Large\boxed{\begin{array}{l}\sf[9^2+(10-4)^2]\div(12-9)^2\\\sf[ 81+6^2]\div(3)^2\\\sf[81+36]\div9\\\sf=117\div9=13\end{array}}[/tex]
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[tex]\Large\boxed{\begin{array}{l}\sf[9^2+(10-4)^2]\div(12-9)^2\\\sf[ 81+6^2]\div(3)^2\\\sf[81+36]\div9\\\sf=117\div9=13\end{array}}[/tex]