Ответ:

Пошаговое объяснение:

а) 3 + 1 3/4 = 4 3/4

9 1/2 - 7 = 2 1/2

1 7/11 + 2 3/11 = 3 10/11

1 - 3/7 = 7/7 - 3/7 = 4/7

4 5/12 + 3 11/12 = 8 16/12 = 9 1/3

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

б) 4 + 2 5/7 = 6 5/7

8 1/3 - 6 = 2 1/3

4 5/13 + 1 2/13 = 5 7/13

1 - 3/5 = 5/5 - 3/5 = 2/5

5 7/10 + 2 9/10 = 7 16/10 = 8 6/10 = 8 3/5

10 1/6 - 6 5/6 = 9 7/6 - 6 5/6 = 3 2/6 =  3 1/3