\[\boxed{\text{Проверьте\ себя}\text{.\ Страницы\ 52-53}}\]
\[\boxed{\text{Проверочная\ работа}\text{.\ Сложение\ и\ вычитание\ смешанных\ чисел}}\]
\[\boxed{\text{1.}}\]
\[\textbf{а)}\ 2 + 3\frac{1}{5} = 5\frac{1}{5}\]
\[\textbf{б)}\ 4\frac{1}{4} + 15 = 19\frac{1}{4}\]
\[\textbf{в)}\ 23\frac{12}{13} + 7\frac{2}{13} = 30\frac{12 + 2}{13} =\]
\[= 30\frac{14}{13} = 30 + 1\frac{1}{13} = 31\frac{1}{13}\]
\[\textbf{г)}\ 2\frac{2}{3} + 5\frac{2}{3} = 7\frac{2 + 2}{3} = 7\frac{4}{3} =\]
\[= 7 + 1\frac{1}{3} = 8\frac{1}{3}\]
\[\boxed{\text{2.}}\]
\[\textbf{а)}\ 10\frac{3}{4} - 9 = 1\frac{3}{4}\]
\[\textbf{б)}\ 4\frac{3}{17} - 3\frac{2}{17} = 1\frac{3 - 2}{17} = 1\frac{1}{17}\]
\[\textbf{в)}\ 35\frac{3}{67} - 35\frac{2}{67} = \frac{3 - 2}{67} = \frac{1}{67}\]
\[\textbf{г)}\ 56\frac{23}{87} - 43\frac{25}{87} =\]
\[= 55\frac{110}{87} - 43\frac{25}{87} =\]
\[= 12\frac{110 - 25}{87} = 12\frac{85}{87}\]
\[\boxed{\text{3.}}\]
\[2 < 2\frac{3}{8} < 3\]
\[5 < 5\frac{1}{9} < 6\]
\[34 < 34\frac{12}{15} < 35\]
\[130 < 130\frac{11}{210} < 131\]
\[\boxed{\text{4.}}\]
\[12\ :a = \frac{12}{a}\]
\[\textbf{а)}\ a < 12:\]
\[a = 1;2;3;4;\ldots;11.\]
\[\textbf{б)}\ a \geq 12:\]
\[a = 12;13;14;\ldots\]
\[\textbf{в)}\ a = 1;2;3;4;6;12.\ \]
Глава 33. Основное свойство дроби