$$(\frac{27}{64})^{\frac{-2}{3}}$$
$\frac{16}{9}\approx 1.777777778$
$$\left(\frac{27}{64}\right)^{-\frac{2}{3}}$$
$$\frac{16}{9}$$
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$\frac{2 ^ {4}}{3 ^ {2}} = 1\frac{7}{9} = 1.7777777777777777$
