\[\boxed{\mathbf{787\ (787).}\mathbf{\ }Еуроки\ - \ ДЗ\ без\ мороки}\]
\[\textbf{а)}\ ( - 42)\ :2 = - 21\]
\[Проверка:\]
\[- 21 \bullet 2 = - 42 \Longrightarrow верно.\]
\[\textbf{б)}\ 70\ :( - 7) = - 10\]
\[Проверка:\]
\[- 7 \bullet ( - 10) = 7 \bullet 10 = 70 \Longrightarrow верно.\]
\[\textbf{в)}\ ( - 24)\ :( - 6) = 4\]
\[Проверка:\]
\[4 \bullet ( - 6) = - 24 \Longrightarrow верно.\]
\[\textbf{г)}\ 0\ :( - 3) = 0\]
\[Проверка:\]
\[0 \bullet ( - 3) = 0 \Longrightarrow верно.\]