Ответ:
Пошаговое объяснение:
1. 3 3/4 - 5,1 = 3,75 - 5,1 = -1,35 = - 1 7/20
2. 3 3/4 + 5,1 = 3,75 + 5,1 = 8,85 = 8 17/20
3. - 1 7/20 : 8 17/20 = - 27/20 : 177/20 = - 9/59
4. 1,4 - 2/7 = 1 2/5 - 2/7 = 1 4/35
5. 1,4 + 2/7 = 1 2/5 - 2/7 = 1 24/35
6. 1 4/35 : 1 24/35 = 39/59
7. - 9/59 : 39/59 = - 3/13