Answer
$\frac{a^{2}}{bc^{5}}$
Work Step by Step
We are given the expression $a^{2}b^{-1}c^{-5}$.
$a^{2}\times b^{-1}\times c^{-5}=a^{2}\times \frac{1}{b}\times\frac{1}{c^{5}}=\frac{a^{2}}{bc^{5}}$
In general, $x^{−b}=\frac{1}{x^{b}}$, for some number x.