Verified answer

Пошаговое объяснение:

1) 5 2/5 + 6 4/15 = 5 6/15 + 6 4/15 = 11 10/15 = 11 2/3

4) 2 3/5 + 6 1/10 = 2 6/10 + 6 1/10 = 8 7/10

7) 5 7/11 + 9/22 = 5 14/22 + 9/22 = 5 23/22 = 6 1/22