8/4
2/1 : 4/3
3/2
6/20 + 21/20
3/12
7/6
1/2 x (3 +3/5)
27/20
3/4 x 1/3
9/5
4/2
2/3 + 3/6
(-6/4 +-2/4) x -1
10/2 - 6/2