$${ \left( \frac{ 81 }{ 16 } \right) }^{ \frac{ -3 }{ 4 } }$$
$\frac{8}{27}\approx 0.296296296$
$$\left(\frac{81}{16}\right)^{-\frac{3}{4}}$$
$$\frac{8}{27}$$
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$\frac{2 ^ {3}}{3 ^ {3}} = 0.2962962962962963$
