\[\mathbf{Страница\ 62.}\]
\[\boxed{\mathbf{1.}}\]
\[\textbf{а)}\ не\ изменяются.\]
\[\textbf{б)}\ не\ изменяются.\]
\[\textbf{в)}\ меняются\ на\ \]
\[противоположные.\]
\[\textbf{г)}\ меняются\ на\ \]
\[противоположные.\]
\[\boxed{\mathbf{2.}}\]
\[\textbf{а)} + (26 + 75) = 26 + 75\]
\[\textbf{б)} + (26 - 75) = 26 - 75\]
\[\textbf{в)} + ( - 26 + 75) = - 26 + 75\]
\[\textbf{г)} + ( - 26 - 75) = - 26 - 75\]
\[\textbf{д)} - (41 + 96) = - 41 - 96\]
\[\textbf{е)} - (41 - 96) = - 41 + 96\]
\[\textbf{ж)} - ( - 41 + 96) = 41 - 96\]
\[\textbf{з)} - ( - 41 - 96) = 41 + 96\]
\[\boxed{\mathbf{3.}}\]
\[37 + (61 + 97) = 37 + 61 + 97 =\]
\[= 37 - ( - 61 - 97)\]
\[37 + (61 - 97) = 37 + 61 - 97 =\]
\[= 37 - ( - 61 + 97)\]
\[37 + ( - 61 + 97) = 37 - 61 + 97 =\]
\[= 37 - (61 - 97)\]
\[37 + ( - 61 - 97) = 37 - 61 - 97 =\]
\[= 37 - (61 + 97)\]
\[\boxed{\mathbf{4.}}\]
\[\textbf{а)}\ (84 - 27) - (39 - 27) - (84 - 39) =\]
\[= 84 - 27 - 39 + 27 - 84 + 39 = 0\]
\[\textbf{б)} - (59 - 36) - (47 - 59) + (47 - 36) =\]
\[= - 59 + 36 - 47 + 59 + 47 - 36 = 0\]
\[\textbf{в)}\ \left( 3\frac{7}{10} + 4\frac{24}{25} \right) - \left( 3\frac{7}{10} - 3\frac{1}{25} \right) =\]
\[= 3\frac{7}{10} + 4\frac{24}{25} - 3\frac{7}{10} + 3\frac{1}{25} =\]
\[= 7\frac{25}{25} = 8\]
\[\textbf{г)} - ( - 31 + 16) - (5 - 31) + ( - 64 - 38) =\]
\[= 31 - 16 - 5 + 31 - 64 - 38 =\]
\[= 62 - 123 = - 61\]