$$1\frac{2}{5}+\frac{1}{5}$$
$\frac{8}{5}=1.6$
$$\frac{5+2}{5}+\frac{1}{5}$$
$$\frac{7}{5}+\frac{1}{5}$$
$$\frac{7+1}{5}$$
$$\frac{8}{5}$$
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$\frac{2 ^ {3}}{5} = 1\frac{3}{5} = 1.6$