Ответ:

29/56, 1/16 , 41/42 , 1/6 , 17/20

Пошаговое объяснение:

1/7+3/8= 8/56 + 21/56 = 29/56

3/8-5/16= 6/16- 5/16 = 1/16

5/6+ 1/7 = 35/42 + 6/42 = 41/42

5/9 - 7/18 = 10/18 - 7/18 = 3/18 = 1/6

1/4 +3 /5 = 5/20+ 12/20 = 17/20