Verified answer

Пошаговое объяснение:

№7

8 8/15 - 5 9/20 = 8 32/60 - 5 27/60 =

3 5/60 = 3 1/12

№3

7 3/4 - 5/12 = 7 9/12 - 5/12 = 7 4/12 = 7 1/3

№4

8 5/16 - 3/20 = 8 25/80 - 12/80 = 8 13/80