\[\boxed{\mathbf{Решаем}\mathbf{\ }\mathbf{устно}\mathbf{\ }\mathbf{параграф}\mathbf{\ }\mathbf{13}\mathbf{.}\mathbf{\ }Еуроки\ - \ ДЗ\ без\ мороки}\]
\[\boxed{\mathbf{1.}}\]
\[\boxed{\mathbf{2.}}\]
\[7x = 1\]
\[x = \frac{1}{7}\]
\[Ответ:при\ x = \frac{1}{7}.\]
\[\boxed{\mathbf{3.}}\]
\[\frac{1}{x} > \frac{1}{10}\ \ при\ \ x < 10.\]
\[Получаем\ дроби:\]
\[\frac{1}{9},\ \frac{1}{8},\ \frac{1}{7},\ \frac{1}{6},\ \frac{1}{5},\ \frac{1}{4},\ \frac{1}{3},\ \frac{1}{2};\frac{1}{1}.\]