$$\sqrt{ \frac{ 0.16 }{ 0.4 } }$$
$\frac{\sqrt{10}}{5}\approx 0.632455532$
$$\sqrt{\frac{16}{40}}$$
$$\sqrt{\frac{2}{5}}$$
$$\frac{\sqrt{2}}{\sqrt{5}}$$
$$\frac{\sqrt{2}\sqrt{5}}{\left(\sqrt{5}\right)^{2}}$$
$$\frac{\sqrt{2}\sqrt{5}}{5}$$
$$\frac{\sqrt{10}}{5}$$
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