$$( 2 ^ { - 1 } \times 3 ^ { - 1 } ) ^ { 2 } \times ( \frac { - 3 } { 8 } ) ^ { - 1 } =$$
$-\frac{2}{27}\approx -0.074074074$
$$\left(\frac{1}{2}\times 3^{-1}\right)^{2}\times \left(\frac{-3}{8}\right)^{-1}$$
$$\left(\frac{1}{2}\times \frac{1}{3}\right)^{2}\times \left(\frac{-3}{8}\right)^{-1}$$
$$\left(\frac{1}{6}\right)^{2}\times \left(\frac{-3}{8}\right)^{-1}$$
$$\frac{1}{36}\times \left(\frac{-3}{8}\right)^{-1}$$
$$\frac{1}{36}\left(-\frac{3}{8}\right)^{-1}$$
$$\frac{1}{36}\left(-\frac{8}{3}\right)$$
$$-\frac{2}{27}$$
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$-\frac{2}{27} = -0.07407407407407407$
