Answer
$\frac{\sqrt 5}{5}$
Work Step by Step
$\sqrt \frac{1}{5}=\frac{\sqrt 1}{\sqrt 5}=\frac{\sqrt 1 \times \sqrt5}{\sqrt 5 \times \sqrt5}=\frac{\sqrt (1\times5)}{5}=\frac{\sqrt 5}{5}$
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