Answer
$ \frac{1}{p^2(m+n)}$
Work Step by Step
$\frac{[p^2(m+n)^3]^{-2}}{p^{-2}(m+n)^{-5}}=p^{-4}(m+n)^{-6}\times p^2(m+n)^5=p^{-2}(m+n)^{-1}=\frac{1}{p^2(m+n)}$
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