Answer
$(8x^2y)^{5/7}$
Work Step by Step
Using $a^{m/n}=\sqrt[n]{a^m}=(\sqrt[n]{a})^m$, the given expression, $
\left( \sqrt[7]{8x^2y} \right)^5
,$ is equivalent to
\begin{array}{l}\require{cancel}
(8x^2y)^{5/7}
.\end{array}
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