Пошаговое объяснение:

1) 1/10 + 1/5 = 1/10 + 2/10 = 3/10

2) 2/7 + 1/3 = 6/21 + 7/21 = 13/21

3) 1/3 + 1/2 = 2/6 + 3/6 = 5/6

4) 3/4 - 2/9 = 27/36 - 8/36 = 19/36

5) 1/4 + 5/6 = 3/12 + 10/12 = 13/12 = 1 1/12

6) 5/8 - 1/6 = 15/24 - 4/24 = 11/24