Answer
$\dfrac{1}{9}$
Work Step by Step
Substituting $
x
$ with $
3
$, then the given expression, $
5x\div15x^2
$, evaluates to
\begin{array}{l}\require{cancel}
5(3)\div15(3)^2
\\\\=
15\div15(9)
\\\\=
\dfrac{\cancel{15}}{\cancel{15}(9)}
\\\\=
\dfrac{1}{9}
.\end{array}
