Ответ:

1) x=110°, x-40 = 70°  2) x= 30°, x+120=150° 3) x= 66°30' , x+47 = 113°30'

Объяснение:

1) 180° = x+x-40°

220° = 2x

x = 110°

x-40 = 110°-40°=70°

2) 180° = x+x+120°

60° = 2x

x = 30°

x + 120° = 150°

3) 180° = x + x + 47

133° = 2x

x = 66.5° или 66°30'

x + 47 = 66°30' + 47 = 113.5° или 113°30'