Answer
$3m$
Work Step by Step
Using $\dfrac{a^x}{a^y}=a^{x-y}$, then the expression, $
\dfrac{(3m)^9}{(3m)^8}
$, simplifies to
\begin{array}{l}\require{cancel}
(3m)^{9-8}
\\\\=
(3m)^{1}
\\\\=
3m
.\end{array}
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