\[\boxed{\mathbf{Проверьте\ себя.\ Страница\ 81}}\]
\[\boxed{\mathbf{Проверочная\ работа.\ \ Раскрытие\ скобок}}\]
\[\boxed{\text{1.}}\]
\[- 4 + (4 - m) = - 4 + 4 - m =\]
\[= - m.\]
\[\boxed{\text{2.}}\]
\[7 - (x + 7) = 7 - x - 7 = - x.\]
\[\boxed{\text{3.}}\]
\[(a + b) - (b - 2) =\]
\[= a + b - b + 2 = a + 2.\]
\[\boxed{\text{4.}}\]
\[(x - y) + (y - x) =\]
\[= x - y + y - x = 0.\]
\[\boxed{\text{5.}}\]
\[- \left( k + ( - 10) \right) = - (k - 10) =\]
\[= - k + 10.\]
\[\boxed{\text{6.}}\]
\[- ( - x + 3) = x - 3.\]
\[\boxed{\text{7.}}\]
\[Нет.\]
\[\boxed{\text{8.}}\]
\[Да.\]