Выполните действия 3/4-1/4 5/8+3/8 7/12-5/12 8/15+2/15 3/10+1/10 17/25-12/25 1/30+7/30 28/45-13/45

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

5/8 + 3/8 = 8/8 = 1

7/12 - 5/12 = 2/12 = 1/6

8/15 + 2/15 = 10/15 = 2/3

3/10 + 1/10 = 4/10 = 2/5

17/25 - 12/25 = 5/25 = 1/5

1/30 + 7/30 = 8/30 = 4/15

28/45 - 13/45 = 15/45 = 1/3