сделайте, весь первый столбик (помечен красным) даю 17 поинтов

1 ) ∠BOC + ∠AOB = ∠AOC = 120° ;

∠BOC + 3∠BOC = 120° ;

4∠BOC = 120° ;

∠BOC = 30° ; ∠AOB = 3*30° = 90° . В - дь : ∠BOC = 30° ; ∠AOB = 90° .

2 ) ∠AOB + ∠BOC = ∠AOC = 150° ;

∠AOB + 4∠AOB = 150° ;

5∠AOB = 150° ;

∠AOB = 30° ; ∠BOC = 4*30° = 120°. В - дь : ∠BOC = 120° ; ∠AOB = 30° .

3 ) ∠COD = ∠AOB - ( ∠AOD + ∠COB ) = 125° - ( 20° + 25° ) = 80° .

В - дь : ∠COD = 80° .

4 ) ∠COB = ∠AOB - ( ∠AOD + ∠COD ) = 130° - ( 20° + 45° ) = 65° .

В - дь : ∠COB = 65° .