Answer
$60c^4d^5$
Work Step by Step
Using $x^a\cdot x^b=x^{a+b}$, the given expression, $
(2c^3d)(-6d^3)(-5cd)
,$ simplifies to
\begin{array}{l}\require{cancel}
(2)(-6)(-5)c^{3+1}d^{1+3+1}
\\\\=
60c^4d^5
.\end{array}
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