\[\boxed{\mathbf{769\ (769)}\mathbf{.}\mathbf{\ }Еуроки\ - \ ДЗ\ без\ мороки}\]
\[\textbf{а)} - 3 + ( - 8) + ( - 9) = - 3 - 8 - 9\]
\[\textbf{б)} - 2 - ( - 4) + ( - 10) = - 2 + ( + 4) + ( - 10) = - 2 + 4 - 10\]
\[\textbf{в)} - 5 + ( - 17) + 4 - ( - 3) = - 5 + ( - 17) + 4 + ( + 3) = - 5 - 17 + 4 + 3\]
\[\textbf{г)}\ 4 + ( - 1) - ( - 2) + ( - 3) - 8 = 4 + ( - 1) + ( + 2) + ( - 3) - 8 =\]
\[= 4 - 1 + 2 - 3 - 8\]