1) 3/4 + 5/6 = (18+20) / 24 = 38/24 = 1 целая 7/12
2)11/12 - 5/8 = (88-60) / 96 = 28/96 = 7/24
3) ((7/9) * 3) / 14 = (7/3) : (1/14) = (7/3) * (14/1) = 1/6
4) (5/18) : (25/24) = (5/18) * (24/25) = 4/15
5) 7 - 3 целых 4/7 = (7/1) - (25/7) = (49-25)/7 = 24/7 = 3 целых 3/7
6) 6 целых 1/6 - 3 целых 7/12 = 37/6 - 43/12 = (74-43)/12 = 31/12 = 2 целых 7/12
7) 3 целых 3/5 * 2 целых 1/12 = (18/5) * (25/12) = 15/2 = 7 целых 1/2
8) 7 целых 6/7 : 9 целых 3/7 = (55/7) : (66/7) = (55/7) * (7/66) = 5/6