1) 4 8/9 - 1 5/6 = 4 16/18 - 1 15/18 = 3 1/18
2) 2/3 + 5/9 = 6/9 + 5/9 = 11/9
3) 55/18 : 11/9 = 55/18 * 9/11 = 5/2
4) 1 1/6 + 2 1/2 = 1 1/6 + 2 3/6 = 3 4/6 = 3 2/3
5) 3 4/5 - 2 1/3 = 3 12/15 - 2 5/15 = 1 7/15
6) 11/9 : 22/15 = 11/9 * 15/22 = 5/6
7) 5/2 : 5/6 = 5/2 * 6/5 = 3
8) 3/4 + 5/6 - 3/8 = 18/24 + 20/24 - 9/24 = 29/24
9) 5 1/8 - 1 1/2 = 4 9/8 - 1 4/8 = 3 5/8
10) 29/24 : 29/8 = 29/24 * 8/29 = 1/3
11) 3 * 1/3 = 1
12) 1 + 2/3 = 1 2/3
Ответ: 1 2/3