$$\frac{9}{5}\times\frac{18}{7}$$
$\frac{162}{35}\approx 4.628571429$
$$\frac{9\times 18}{5\times 7}$$
$$\frac{162}{35}$$
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$\frac{2 \cdot 3 ^ {4}}{5 \cdot 7} = 4\frac{22}{35} = 4.628571428571429$