$$(\frac{3}{4})^{7}\div(\frac{3}{4})^{4}$$
$\frac{27}{64}=0.421875$
$$\left(\frac{3}{4}\right)^{3}$$
$$\frac{27}{64}$$
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$\frac{3 ^ {3}}{2 ^ {6}} = 0.421875$