Пошаговое объяснение:

б) 8 - 3 6/9 = 7 9/9 - 3 6/9 = 4 3/9 = 4 1/3

г)

1) 2 1/3 + 1 2/3 = 3 3/3 = 4

2) 4 1/5 - 4/5 = 3 6/5 - 4/5 = 3 2/5

3) 4 - 3 2/5 = 3 5/5 - 3 2/5 = 3/5