$$\frac { \sqrt { 2 } - 1 } { \sqrt { 5 } }$$
$\frac{\sqrt{5}\left(\sqrt{2}-1\right)}{5}\approx 0.185241937$
$$\frac{\left(\sqrt{2}-1\right)\sqrt{5}}{\left(\sqrt{5}\right)^{2}}$$
$$\frac{\left(\sqrt{2}-1\right)\sqrt{5}}{5}$$
$$\frac{\sqrt{2}\sqrt{5}-\sqrt{5}}{5}$$
$$\frac{\sqrt{10}-\sqrt{5}}{5}$$
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