\[\boxed{\mathbf{306\ (306)}.\ Еуроки\ - \ ДЗ\ без\ мороки}\]
\[\angle CDE = 152{^\circ};\ \ \ \angle CDA = 98{^\circ}.\]
\[\angle ADE = \angle CDE - \angle CDA =\]
\[= 152{^\circ} - 98{^\circ} = 54{^\circ}.\]
\[Ответ:54{^\circ}.\]