9/11 - 3/11 =
8/13 + 10/13 + 11/13 =
2/7 + 1/7 =
1/8 + 5/8 =
9/4 - 7/4 =
10/3 - 4/3 - 5/3 =
3/5 - 1/5 =
11/6 + 12/6 =
1/2
3/7
3/4
29/13
1/3
2/5
6/11
23/6
