Ответ: 14 4/5 — 6 11/12 + 12 3/4 — 7 2/15= 13 1/28 (4/5-11/12)=8 (48/60-55/60)= 8-7/60= 7 53/607 53/60+12 3/4=19(53/60+3/4)=19 (53+45/60)==20 38/60=20 19/3020 19/30- 7 2/15= 13 (19/30-2/15)=13 15/30==13 1/22 2/3 ×3 3/4=8/3× 15/4=1010 2/3 — 3 11/12= 7 (2/3-11/12)= 7 (8-11/12)=7 -3/12==7 -1/4=6 3/4