\[ -\frac{1}{6} + \frac{5}{6} = \frac{-1+5}{6} = \frac{4}{6} \]
\[ \frac{4}{6} = \frac{2 \times 2}{3 \times 2} = \frac{2}{3} \]
\[ \left(\frac{2}{3}\right)^3 = \frac{2^3}{3^3} = \frac{8}{27} \]
Ответ: 8/27