$$\{ ( \frac { 1 } { 3 } ) ^ { - 3 } - ( \frac { 1 } { 2 } ) ^ { - 3 } \} \div ( \frac { 1 } { 4 } ) ^ { - 3 } =$$
$\frac{19}{64}=0.296875$
$$\frac{27-\left(\frac{1}{2}\right)^{-3}}{\left(\frac{1}{4}\right)^{-3}}$$
$$\frac{27-8}{\left(\frac{1}{4}\right)^{-3}}$$
$$\frac{19}{\left(\frac{1}{4}\right)^{-3}}$$
$$\frac{19}{64}$$
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$\frac{19}{2 ^ {6}} = 0.296875$
