Ответ:

2) 1 20/32 = 1 5/8. Тогда 1 5/8 + 3 1/2 = 1 5/8 + 3 4/8 = 5 1/8.

4) 2 5/25 = 2 2/5. Тогда 1 7/16 + 2 2/5 = 3 + 35/80 + 32/80 = 3 67/80.

6) 1 21/36 = 1 7/12. Тогда 3 2/15 − 1 7/12 = 2 + 8/60 − 35/60 = 1 33/60 = 1 11/20.

8) 2 1/4 − 3 2/5 = 9/4 − 17/5 = 45/20 − 68/20 = −1 3/20.

10) 1 3/30 = 1 1/10. Тогда 3 19/24 − 1 1/10 = 2 + 95/120 − 12/120 = 2 83/120.

12) 3 1/6 · 3 9/12 = 19/6 · 15/4 = 95/8 = 11 7/8.

14) 6 2/7 : 2 12/14 = 44/7 : 20/7 = 44/20 = 2 1/5.