6/7 + 4/7 = 1 i 3/7
1 i 3/4 + 2/4 = 2 i 1/4
17 i 3/5 + 1 i 4/5 = 19 i 2/5
4 i 6/8 + 2 i 3/8 = 7 i 1/8
1 i 3/11 + 4 i 9/11 = 6 i 1/11
3 i 5/6 + 15 i 4/6 = 19 i 3/6
