$$\frac{4}{5}\times\frac{9}{2}$$
$\frac{18}{5}=3.6$
$$\frac{4\times 9}{5\times 2}$$
$$\frac{36}{10}$$
$$\frac{18}{5}$$
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$\frac{2 \cdot 3 ^ {2}}{5} = 3\frac{3}{5} = 3.6$