\[\boxed{\mathbf{767.еуроки - ответы\ на\ пятёрку}}\]
\[\textbf{а)}\ x = \frac{360{^\circ} - 152{^\circ} - 80{^\circ}}{2} =\]
\[\textbf{б)}\ x = 360{^\circ} - 125{^\circ} - 30{^\circ} \bullet 2 =\]
\[= 360{^\circ} - 185{^\circ} = 175{^\circ}.\]
\[\textbf{в)}\ x = \frac{360{^\circ} - 112{^\circ} - 180{^\circ}}{2} =\]
\[\textbf{г)}\ x = 360{^\circ} - 215{^\circ} - 20{^\circ} \bullet 2 =\]
\[= 360{^\circ} - 255{^\circ} = 105{^\circ}.\]
\[Ответ:а)\ 64{^\circ};б)\ 175{^\circ};\]
\[\textbf{в)}\ 34{^\circ};г)\ 105{^\circ}.\]