\[\boxed{\mathbf{916\ (916)}\mathbf{.}\mathbf{\ }Еуроки\ - \ ДЗ\ без\ мороки}\]
\[\textbf{а)}\ 5\frac{1}{2} + ( - 3) = 5\frac{1}{2} - 3 = 2\frac{1}{2}\]
\[\textbf{б)}\ 4\frac{9}{11} + \left( - 2\frac{1}{11} \right) = 4\frac{9}{11} - 2\frac{1}{11} = 2\frac{8}{11}\]
\[\textbf{в)}\ 2\frac{1}{2} + ( - 6) = 2\frac{1}{2} - 6 = - \left( 6 - 2\frac{1}{2} \right) = - 3\frac{1}{2}\]
\[\textbf{г)}\ \left( - \frac{4}{5} \right) + \frac{1}{2} = \frac{1}{2} - \frac{4}{5} = \frac{5}{10} - \frac{8}{10} = - \left( \frac{8}{10} - \frac{5}{10} \right) = - \frac{3}{10}\]