Answer
$\frac{n^3}{m^3}$
Work Step by Step
$(m/n)^{-3}$
$\frac{(1/m)^3}{(1/n)^3}$
$\frac{(1/m)^3*m^3}{(1/n)^3*m^3}$
$\frac{1}{\frac{m^3}{n^3}}$
$\frac{1*n^3}{\frac{m^3}{n^3}*n^3}$
$\frac{n^3}{m^3}$
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