$$\frac{12^{-3}}{9^{-4}}$$
$\frac{243}{64}=3.796875$
$$\frac{\frac{1}{1728}}{9^{-4}}$$
$$\frac{\frac{1}{1728}}{\frac{1}{6561}}$$
$$\frac{1}{1728}\times 6561$$
$$\frac{243}{64}$$
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$\frac{3 ^ {5}}{2 ^ {6}} = 3\frac{51}{64} = 3.796875$