14 целых 4/5-6 целых 11/12+12 целых 3/4-7 целых 2/15 +2целых2/3*3целых 3/4 10 целых 2/3-3 целых 11/12

14 4/5 - 6 11/12 + 12 3/4 - 7 2/15= 13 1/2
8 (4/5-11/12)=8 (48/60-55/60)= 8-7/60= 7 53/60
7 53/60+12 3/4=19(53/60+3/4)=19 (53+45/60)=
=20 38/60=20 19/30
20 19/30- 7 2/15= 13 (19/30-2/15)=13 15/30=
=13 1/2

2 2/3 ×3 3/4=8/3× 15/4=10

10 2/3 - 3 11/12= 7 (2/3-11/12)= 7 (8-11/12)=7 -3/12=
=7 -1/4=6 3/4