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