Пошаговое объяснение:

№1

3 4/5 - 2 3/5 = (3-2) + (4-3)/5 = 1 + 1/5 = 1 1/5

№2

7 5/6 - 4 2/3 = 7 5/6 - 4 4/6 = (7-4) + (5-4)/6 = 3 + 1/6 = 3 1/6

№3

4 5/6 - 2 5/12 = 4 10/12 - 2 5/6 = 4 10/12 - 2 10/12 = 2

№4

10 4/9 - 8 5/18 = 10 8/18 - 8 5/18 = (10-8) + (8-5)/18 = 2 + 3/18 = 2 3/18 = 2 1/6

№5

9 1/2 - 2 1/4 = 9 2/4 - 2 1/4 = (9-2) + (2-1)/4 = 7 + 1/4 = 7 1/4

№6

6 3/4 - 2 2/3 = 6 9/12 - 2 8/12 = (6-2) + (9-8)/12 = 4 + 1/12 = 4 1/12

№7

11 3/7 - 5 1/3 = 11 9/21 - 5 7/21 = (11-5) + (9-7)/21 = 6 + 2/21 = 6 2/21

№8

8 3/5 - 6 3/10 = 8 6/10 - 6 3/10 = (8-6) + (6-3)/10 = 2 + 3/10 = 2 3/10