Answer
$\frac{1}{216}$
Work Step by Step
The given expression is
$=6^{-8}\cdot 6^5$
Use $a^n\cdot b^m=a^{n+ m}$.
$=6^{-8+ 5}$
Simplify.
$=6^{-3}$
Use $a^{-n}=\frac{1}{a^n}$.
$=\frac{1}{6^{3}}$
Use $6^3=216$.
$=\frac{1}{216}$.
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