Решебник по математике 6 класс Виленкин Часть 1, 2 Часть 2. Задачи на повторение 12

\[\boxed{\mathbf{П.\ 12}}\]

\[\textbf{а)}\ \frac{5}{8} - \frac{3}{5} = \frac{25}{40} - \frac{24}{40} = \frac{1}{40} > 0\]

\[\frac{5}{8} > \frac{3}{5}\]

\[\textbf{б)}\ \frac{7}{12} - \frac{11}{18} = \frac{21}{36} - \frac{22}{36} =\]

\[= - \frac{1}{36} < 0\]

\[\frac{7}{12} < \frac{11}{18}\]

\[\textbf{в)}\ - \frac{9}{13} - \left( - \frac{5}{9} \right) = - \frac{9}{13} + \frac{5}{9} =\]

\[= - \frac{81}{117} + \frac{65}{117} = - \frac{16}{117} < 0\]

\[- \frac{9}{13} < - \frac{5}{9}\]

\[\textbf{г)}\ - \frac{8}{9} - \left( - \frac{4}{105} \right) =\]

\[= - \frac{280}{315} + \frac{12}{315} = - \frac{266}{315} < 0\]

\[- \frac{8}{9} < - \frac{4}{105}\]