1) 7 5/12 - 5 3/4 = 7 5/12 - 5 9/12 = 1 17/12- 9/12 = 1 8/12= 1 2/3
2) 1 2/3 : 22 1/2= 1 2/3 * 2/45= 5/3*2/45 =2/27
3) 10/1*5/18= 2 7/9
4) 2/27 + 2 7/9= 2 23/27
5) 2 4/9 : 2 23/27=2 12/27: 2 23/27=66/27 : 77/27 = 6/7
6) 2/5 +6/7=14/35+30/35=1 9/35
7) 1 9/35- 4/5=1 9/35 - 28/35=16/35
ответ: 16/35