1. 1/6 + 4/6 = 5/6
2. 7/8 + 6/8 = 13/8 = 1 целая 5/8
3. 12/21 + 2/21 = 14/21 = 2/3
4. 9/12 + 9/12 = 18/12 = 1 целая 1/2
5. 8/9 + 3/9 = 11/9 = 1 целая 2/9
6. 12/15 + 7/15 = 19/15 = 1 целая 4/15
7. 2/21 + 10/21 = 12/21
8. 9/54 + 10/54 = 19/54
9. не знаю
Пошаговое объяснение:
1. 1/6 + 4/6 = 5/6
2. 7/8 + 6/8 = 13/8 = 1 целая 5/8
3. 12/21 + 2/21 = 14/21 = 2/3
4. 9/12 + 9/12 = 18/12 = 1 целая 1/2
5. 8/9 + 3/9 = 11/9 = 1 целая 2/9
6. 12/15 + 7/15 = 19/15 = 1 целая 4/15
7. 2/21 + 10/21 = 12/21
8. 9/54 + 10/54 = 19/54
9. не знаю
Пошаговое объяснение: