Решебник по математике 6 класс Ерина Виленкин рабочая тетрадь Часть 1, 2 Часть 2 | Страница 68

\[Стр.\ 68.\]

\[\boxed{\mathbf{2.}}\]

\[\textbf{а)} + (26 + 75) = 26 + 75 = 101\]

\[\textbf{б)} + (26 - 75) = 26 - 75 =\]

\[= - 49\]

\[\textbf{в)} + ( - 26 + 75) = - 26 + 75 =\]

\[= 49\]

\[\textbf{г)} + ( - 26 - 75) = - 26 - 75 =\]

\[= - 101\]

\[\textbf{д)} - (41 + 96) = - 41 - 96 =\]

\[= - 137\]

\[\textbf{е)} - (41 - 96) = - 41 + 96 = 55\]

\[\textbf{ж)} - ( - 41 + 96) = 41 - 96 =\]

\[= - 55\]

\[\textbf{з)} - ( - 41 - 96) = 41 + 96 =\]

\[= 137\]

\[\boxed{\mathbf{3.}}\]

\[37 + (61 + 97) =\]

\[= 37 + 61 + 97 =\]

\[= 37 - ( - 61 - 97)\]

\[37 + (61 - 97) =\]

\[= 37 + 61 - 97 =\]

\[= 37 - ( - 61 + 97)\]

\[37 + ( - 61 + 97) =\]

\[= 37 - 61 + 97 =\]

\[= 37 - (61 - 97)\]

\[37 + ( - 61 - 97) =\]

\[= 37 - 61 - 97 =\]

\[= 37 - (61 + 97)\]

\[\boxed{\mathbf{4.}}\]

\[\textbf{в)}\ 136 + (6,3 + 64) =\]

\[= 136 + 6,3 + 64 = 200 + 6,3 =\]

\[= 206,3\]

\[\textbf{г)}\ (3,7 + 4,96) - (3,7 - 3,04) =\]

\[= 3,7 + 4,96 - 3,7 + 3,04 = 8\]

\[\textbf{д)} - 7,8 - (5,39 - 12,8) =\]

\[= - 7,8 - 5,39 + 12,8 =\]

\[= 5 - 5,39 = - 0,39\]

\[= 3,91 - 6,57 + 6,57 - 2,91 = 1\]

\[= 5\frac{1}{3} + 5 = 10\frac{1}{3}\]

\[\textbf{з)}\ \left( 2\frac{1}{4} - 7\frac{2}{9} \right) + \left( 8,25 - 2\frac{7}{9} \right) =\]

\[= 2\frac{1}{4} - 7\frac{2}{9} + 8,25 - 2\frac{7}{9} =\]

\[= 10,5 - 10 = 0,5\]