1) 3 1/3 + 2,5 = 10/3 + 5/2 = 20/6 + 15/6 = 35/6
2) 2,5 - 1 1/3 = 5/2 - 4/3 = 15/6 - 8/6 = 7/6
3) 35/6 : 7/6 = 35/6 * 6/7 = 5
4) 4,6 - 2 1/3 = 23/5 - 7/3 = 69/15 - 35/15 = 34/15
5) 4,6 + 2 1/3 = 23/5 + 7/3 = 69/15 + 35/15 = 104/15
6) 34/15 : 104/15 = 34/15 * 15/104 = 17/52
7) 5 * 17/52 = 85/52
8) 85/52 * 5,2 = 85/52 * 52/10 = 85/10 = 8,5
9) 1/7 - 0,125 =1/7 - 1/8 = 8/56 - 7/56 = 1/56
10) 0.05 : 1/56 = 1/20 * 56 = 56/20 = 14/5 = 2,8
11) 2,8 + 5,7 = 8,5
12) 8,5: 8,5 = 1
ответ : 1