$$\frac{ 2 }{ 5 } / \frac{ 1 }{ 2 }$$
$\frac{4}{5}=0.8$
$$\frac{2}{5}\times 2$$
$$\frac{2\times 2}{5}$$
$$\frac{4}{5}$$
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$\frac{2 ^ {2}}{5} = 0.8$