$$9^{-1\frac{1}{2}}$$
$\frac{1}{27}\approx 0.037037037$
$$9^{-\frac{2+1}{2}}$$
$$9^{-\frac{3}{2}}$$
$$\frac{1}{27}$$
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$\frac{1}{3 ^ {3}} = 0.037037037037037035$
