$$\frac{5}{28}+\frac{4}{28}$$
$\frac{9}{28}\approx 0.321428571$
$$\frac{5+4}{28}$$
$$\frac{9}{28}$$
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$\frac{3 ^ {2}}{2 ^ {2} \cdot 7} = 0.32142857142857145$
