\[\boxed{\ \mathbf{999\ (999)}.\ Еуроки\ - \ ДЗ\ без\ мороки}\]
\[\boxed{\mathbf{999}\mathbf{.}\mathbf{\ }}\]
\[\frac{19}{56} < x < \frac{37}{56};\]
\[Приведем\ все\ дроби\ к\ общему\ \]
\[знаменателю:\]
\[x = \frac{3}{7};\frac{9}{14};\frac{5}{8};\frac{15}{28}.\]