$$(16)^{-3/4}+2^{-3}+(8)^{-2/3}$$
$\frac{1}{2}=0.5$
$$16^{-\frac{3}{4}}+2^{-3}+8^{\frac{-2}{3}}$$
$$\frac{1}{8}+2^{-3}+8^{\frac{-2}{3}}$$
$$\frac{1}{8}+\frac{1}{8}+8^{\frac{-2}{3}}$$
$$\frac{1}{4}+8^{\frac{-2}{3}}$$
$$\frac{1}{4}+8^{-\frac{2}{3}}$$
$$\frac{1}{4}+\frac{1}{4}$$
$$\frac{1}{2}$$
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$\frac{1}{2} = 0.5$
