\[\boxed{\mathbf{1033\ (1033).}\mathbf{\ }Еуроки\ - \ ДЗ\ без\ мороки}\]
\[\textbf{а)}\ 3,3\ :( - 11) + ( - 2,5)\ :5 = \frac{3,3}{- 11} + \frac{- 2,5}{5} = - 0,3 + ( - 0,5) =\]
\[= - (0,3 + 0,5) = - 0,8\]
\[\textbf{б)}\ ( - 1)\ :\left( \frac{1}{6} - \frac{1}{5} \right) = ( - 1)\ :\left( \frac{5}{30} - \frac{6}{30} \right) = ( - 1)\ :\frac{5 - 6}{30} = ( - 1)\ :\frac{- 1}{30} =\]
\[= ( - 1) \bullet \frac{30}{- 1} = 30\]