$$\frac{-1}{2}\div[\frac{-81}{3}\div\frac{2}{5}]$$
$\frac{1}{135}\approx 0.007407407$
$$\frac{-\frac{2}{5}}{2\times \frac{-81}{3}}$$
$$\frac{-\frac{2}{5}}{2\left(-27\right)}$$
$$\frac{-\frac{2}{5}}{-54}$$
$$\frac{-2}{5\left(-54\right)}$$
$$\frac{-2}{-270}$$
$$\frac{1}{135}$$
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$\frac{1}{3 ^ {3} \cdot 5} = 0.007407407407407408$
