Выполните вычитание: №1 а) 4/5 - 1/3 в) 4/5 - 3/4 №2 а) 9/14 - 2/7 в) 7/10 - 2/5 №3 а) 7/12 - 2/9 в) 7/10 - 4/15

4/5 - 1/3 = 12/15 - 5/15 = 7/15
4/5 - 3/4 = 16/20 - 15/20 = 1/20

9/14 - 2/7 = 9/14 - 4/14 = 5/14
7/10 - 2/5 = 7/10 - 4/10 = 3/10

7/12 - 2/9 = 21/36 - 8/36 = 13/36
7/10 - 4/15 = 21/30 - 8/30 = 13/30