1) 1 1/7 - 23/49 = 1 7/49 - 23/49 = 56/49 - 23/49 = 33/49
2) 0,6 : 3 3/4 = 6/10 * 4/15 = 4/25
3) 33/49 : 22/147 = 33/49 * 147/22 = 9/2
4) 4/25 * 2 1/2 = 4/25 * 5/2 = 2/5
5) 3,75 : 1 1/2 = 375/100 * 2/3 = 125/50 = 5/2
6) 9/2 - 2/5 = 45/10 - 4/10 = 41/10
7) 41/10 + 5/2 = 41/10 + 25/10 = 66/10 = 33/5
8) 33/5 : 2,2 = 33/5 : 22/10 = 33/5 : 11/5 = 33/5 * 5/11 = 3