1) 4 5/12 - 3 7/18 = 4 15/36 - 3 14/36 = 1 1/36
2) 1 1/36 : 9,25 = 37/36 : 37/4 = 37/36 * 4/37 = 1/9
3) 1/9 + 5/6 = 2/18 + 15/18 = 17/18
4) 0,4 + 1/8 = 2/5 + 1/8 = 16/40 + 5/40 = 21/40
5) 21/40 + 0,75= 21/40 + 3/4 = 21/40 + 30/40 = 51/40
6) 51/40 * 2/3 = 17/20
7)17/18 : 17/20 = 17/18 * 20/17 = 10/9 = 1 1/9