\[\boxed{\mathbf{765\ (765)}\mathbf{.}\mathbf{\ }Еуроки\ - \ ДЗ\ без\ мороки}\]
\[\textbf{а)} - 256 + 181 = - 75\]
\[\textbf{б)} - 352 - 204 = - 352 + ( - 204) = - 556\]
\[\textbf{в)}\ 725 - 831 = 725 + ( - 831) = - 106\]
\[\textbf{г)}\ 154 - ( - 138) = 154 + 138 = 292\]
\[\textbf{д)} - 206 + ( - 456) = - 662\]
\[\textbf{е)}\ 789 - 1000 = 789 + ( - 1000) = - 211\]