1 действие) 1 4/9 + 2 5/6 = 13/9 + 17/6 = 26/18 + 51/18 = 77/18
2 действие) 77/18 - 2 3/4 = 77/18 - 11/4 = 154/36 - 99/36 = 55/36
3 действие) 2 1/2 - 11/14 = 5/2 - 11/14 = 35/14 - 11/14 = 24/14 =12/7
4 действие) 55/36 * 12/7 = 55/3 * 1/7 = 55/21 = 2целых 13/21