Ответ:
- Общий знаменатель 15: 2/3 + 3/5 = 10/15 + 9/15 = 19/15.
- 7/8 − 9/16 = 14/16 − 9/16 = 5/16.
- 16/25 − 3/10 = 32/50 − 15/50 = 17/50.
- 4/15 + 2/9 = 12/45 + 10/45 = 22/45.
- 7/12 − 8/15 = 35/60 − 32/60 = 3/60 = 1/20.
- 11/12 − 3/8 + 1/4 = 22/24 − 9/24 + 6/24 = 19/24.
