Answer
$\dfrac{x\sqrt[]{5}}{5}$
Work Step by Step
Rationalizing the denominator of $
\dfrac{x}{\sqrt[]{5}}
$ results to
\begin{array}{l}
\dfrac{x}{\sqrt[]{5}}
\cdot
\dfrac{\sqrt[]{5}}{\sqrt[]{5}}
\\\\=
\dfrac{x\sqrt[]{5}}{\sqrt[]{25}}
\\\\=
\dfrac{x\sqrt[]{5}}{5}
.\end{array}