Answer
$\frac{2\sqrt 5}{5}$
Work Step by Step
$\frac{2}{\sqrt 5}=\frac{2(\sqrt 5)}{\sqrt 5(\sqrt 5)}=\frac{2\times\sqrt 5}{\sqrt 5\times\sqrt 5}=\frac{2\sqrt 5}{(\sqrt 5)^{2}}=\frac{2\sqrt 5}{5}$
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