Вычисли: 2 5/12 + 4 7/12 =

1. 2 5/12 + 4 7/12 = 6 + 12/12 = 7 2. 3 2/7 + 5 1/4 = 3 8/28 + 5 7/28 = 8 15/28 3. 3 3/8 + 2 5/6 = 3 9/24 + 2 20/24 = 5 29/24 = 6 5/24 4. 12 + 3 4/13 = 15 4/13 5. 6 9/14 + 2 5/14 = 8 14/14 = 9 6. 10 7/9 - 6 4/9 = 4 3/9 = 4 1/3 7. 5 1/6 - 2 5/8 = 5 4/24 - 2 15/24 = 4 28/24 - 2 15/24 = 2 13/24 8. 8 - 4 11/15 = 7 15/15 - 4 11/15 = 3 4/15 9. 9 4/11 - 6 4/11 = 3 10. 5 1/3 * 5 = 16/3 * 5 = 80/3 = 26 2/3 11. 6 2/5 * 5/16 = 32/5 * 5/16 = 2 12. 2 2/3 * 1 1/5 = 8/3 * 6/5 = 48/15 = 16/5 = 3 1/5 13. 1 3/7 * 3 1/2 = 10/7 * 7/2 = 5 14. 7 1/2 : 5 = 15/2 * 1/5 = 3/2 = 1 1/2 15. 8 1/4 : 3/4 = 33/4 * 4/3 = 11 16. 6 2/5 : 1 3/5 = 32/5 : 8/5 = 32/5 * 5/8 = 4 17. 10 2/3 : 2 2/3 = 32/3 : 8/3 = 32/3 * 3/8 = 4