We have $3^{-2}$, $3^{-1}$, $3^{0}$, $3^{1}$, and $3^{2}$.
$3^{-2}$ is the same as $\frac{1}{3^2}$, which equals $\frac{1}{9}$.
$3^{-1}$ is the same as $\frac{1}{3}$.
$3^{0}$ equals $1$.
$3^{1}$ equals $3$.
$3^{2}$ equals $9$.
So, the expression becomes
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