\[\boxed{\mathbf{753\ (753)}\mathbf{.}\mathbf{\ }Еуроки\ - \ ДЗ\ без\ мороки}\]
\[\textbf{а)} - ( - 8) + 3 = 8 + 3 = 11\]
\[\textbf{б)} - \left( 12 + ( - 1) \right) = - (11) = - 11\]
\[\textbf{в)} - ( - 10) + (6) = 10 + ( - 6) = 4\]
\[\textbf{г)} - \left( ( - 3) + 1 \right) = - ( - 2) = 2\]
\[\textbf{д)} - \left( ( - 20) + ( - 10) \right) = - ( - 30) = 30\]
\[\textbf{е)} - \left( - (6 + 4) \right) = - \left( - (10) \right) = - ( - 10) = 10\]