Verified answer

Пошаговое объяснение:

№1

1) 15 3/4 - 6 4/11 = 15 33/44 - 6 16/44 = 9 17/44

2) 9 17/44 + 7 1/2 = 9 17/44 + 7 22/44 = 16 39/44

№2

1) 2 + 8 7/12 = 10 7/12

2) 10 7/12 - 5 5/6 = 10 7/12 - 5 10/12 = 9 19/12 - 5 10/12 = 4 9/12 = 4 3/4