Answer
$\frac{1}{243}$
Work Step by Step
According to the negative exponent rule, $a^{-n}=\frac{1}{a^{n}}$.
Therefore, $3^{-5}=\frac{1}{3^{5}}=\frac{1}{3\times3\times3\times3\times3}=\frac{1}{243}$.
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