\[\boxed{\mathbf{Проверьте\ себя.\ Страница\ 50}}\]
\[\boxed{\mathbf{Проверочная\ работа\ №1.\ Вычитание}}\]
\[\boxed{\text{1.}}\]
\[- 20 - 0 = - 20.\]
\[\boxed{\text{2.}}\]
\[- 6 - ( - 3) = - 6 + 3 = - 3.\]
\[\boxed{\text{3.}}\]
\[7 - ( - 10) = 7 + 10 = 17.\]
\[\boxed{\text{4.}}\]
\[- 8 - 4 = - 12.\]
\[\boxed{\text{5.}}\]
\[12 - ( - 12) = 12 + 12 = 24.\]
\[\boxed{\text{6.}}\]
\[- 4 - 7 = - 11.\]
\[\boxed{\text{7.}}\]
\[- 5 - ( - 2) = - 5 + 2.\]
\[Да.\]
\[\boxed{\text{8.}}\]
\[Да.\]
\[Например:\ \]
\[- 6 - ( - 12) = - 6 + 12 = 6.\]