$$\frac{1}{5}+\frac{1}{2}$$
$\frac{7}{10}=0.7$
$$\frac{2}{10}+\frac{5}{10}$$
$$\frac{2+5}{10}$$
$$\frac{7}{10}$$
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$\frac{7}{2 \cdot 5} = 0.7$