выполните вычитание 1/3-1/9; 17/18-1/9; 10/21-1/3; 4/9-13/45; 14/15-3/5; 1/3-7/30.

1/3 - 1/9 = 2/9
17/18 - 1/9 = 15/18 = 5/6
10/21 - 1/3 = 3/21 = 1/7
4/9 - 13/45 = 7/45
14/15 - 3/5 = 5/15 = 1/3
1/3 - 7/30 = 3/30 = 1/10 = 0.1