$$\frac{1}{2}\times3\frac{2}{5}$$
$\frac{17}{10}=1.7$
$$\frac{1}{2}\times \frac{15+2}{5}$$
$$\frac{1}{2}\times \frac{17}{5}$$
$$\frac{1\times 17}{2\times 5}$$
$$\frac{17}{10}$$
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$\frac{17}{2 \cdot 5} = 1\frac{7}{10} = 1.7$
