\[\boxed{\text{Проверьте\ себя}\text{.\ Страница\ 36}}\]
\[\boxed{\begin{matrix} \text{Проверочная\ работа\ №}\text{1.\ Сложение\ и\ вычитание\ дробей\ с\ } \\ \text{\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ одинаковыми\ знаменателями} \\ \end{matrix}}\]
\[\boxed{\text{1.}}\]
\[\frac{1}{5} + \frac{3}{5} = \frac{1 + 3}{5} = \frac{4}{5}\text{.\ \ \ }\]
\[\boxed{\text{2.}}\]
\[\frac{43}{90} + \frac{47}{90} = \frac{43 + 47}{90} = \frac{90}{90} = 1.\ \ \ \]
\[\boxed{\text{3.}}\]
\[\frac{11}{13} - \frac{2}{13} = \frac{11 - 2}{13} = \frac{9}{13}\text{.\ \ \ }\]
\[\boxed{\text{4.}}\]
\[\frac{12}{21} - \frac{11}{21} = \frac{12 - 11}{21} = \frac{1}{21}\text{.\ \ \ }\]
\[\boxed{\text{5.}}\]
\[\frac{1}{9} + x = \frac{5}{9}\]
\[x = \frac{5}{9} - \frac{1}{9}\]
\[x = \frac{4}{9}\text{.\ }\]
\[Ответ:\ \frac{4}{9}\text{.\ \ \ }\]
\[\boxed{\text{6.}}\]
\[\frac{12}{17} - x = \frac{8}{17}\]
\[x = \frac{12}{17} - \frac{8}{17}\]
\[x = \frac{4}{17}\text{.\ }\]
\[Ответ:\ \frac{4}{17}\text{.\ \ \ }\]
\[\boxed{\text{7.}}\]
\[Нет.\]
\[\frac{15}{22} + \frac{5}{22} = \frac{20}{22} < 1\text{.\ \ \ }\]
\[\boxed{\text{8.}}\]
\[Да.\]
\[\frac{2}{7} < 1 - правильная\ дробь;\]
\[\frac{7}{2} > 1 - неправильная\ дробь;\]
\[\frac{2}{7} < \frac{7}{2}\text{.\ \ \ \ }\]