19/42

6/15

11/18

2/21

9/15

5/9

26/25 = 1 целая 1/25

10/12=5/6

11/14

3/15=1/5

17/24

7/10

3/9=1/3

1/24

19/19 = 1

Ответ:

2/7+1/6=19/42

14/21-4/7=2/21

4/15+1/3=9/15=3/5

5/24-1/6=1/24

13/15-2/3=3/15