$${ \left( \frac{ 16 }{ 81 } \right) }^{ - \frac{ 1 }{ 2 } } \times { \left( \frac{ 256 }{ 81 } \right) }^{ - \frac{ 2 }{ 4 } }$$
$\frac{81}{64}=1.265625$
$$\frac{9}{4}\times \left(\frac{256}{81}\right)^{-\frac{2}{4}}$$
$$\frac{9}{4}\times \left(\frac{256}{81}\right)^{-\frac{1}{2}}$$
$$\frac{9}{4}\times \frac{9}{16}$$
$$\frac{81}{64}$$
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$\frac{3 ^ {4}}{2 ^ {6}} = 1\frac{17}{64} = 1.265625$
