Answer
$\dfrac{x^{3}}{y^{5}}$
Work Step by Step
Using $a^{-x}=\dfrac{1}{a^{x}}$ and $\dfrac{1}{a^{-x}}=a^x$, the given expression, $
\dfrac{y^{-5}}{x^{-3}}
$, is equivalent to
\begin{array}{l}
\dfrac{x^{3}}{y^{5}}
.\end{array}
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