\[Страница\ 48\]
\[\boxed{\mathbf{59.}}\]
\[11:\]
\[2 + 9\]
\[3 + 8\]
\[4 + 7\]
\[14:\]
\[5 + 9\]
\[6 + 8\]
\[7 + 7\]
\[12:\]
\[9 + 3\]
\[8 + 4\]
\[5 + 7\]
\[13:\]
\[9 + 4\]
\[8 + 5\]
\[7 + 6\]
\[\boxed{\mathbf{60.}}\]
\[1)\ 43 + 7 = 40 + 3 + 7 =\]
\[= 40 + 10 = 50\]
\[50 - 7 = 40 + 10 - 7 =\]
\[= 40 + 3 = 43\]
\[2)\ 84 + 6 = 90\]
\[85 + 5 = 90\]
\[48 + 2 = 50\]
\[21 + 9 = 30\]
\[60 - 4 = 56\]
\[70 - 8 = 62\]
\[\boxed{\mathbf{61.}}\]
\[Первый\ способ.\]
\[10 - (2 + 5) = 10 - 7 =\]
\[= 3\ (м) - ленты\ осталось.\]
\[Второй\ способ.\]
\[(10 - 5) - 2 = 5 - 2 =\]
\[= 3\ (м) - ленты\ осталось.\]
\[Ответ:3\ м.\]