bonjour
3/4 + 2/6 = 9/12 + 4/12 = 13/12
2/15 + 3/20 = 8/60 + 9/60 = 17/60
5/12 - 9/8 = 10/24 - 27/24 = - 17/24
5/6 - 13/9 = 15/18 - 26/18 = - 11/18
5/12 * 2/15 = 10/180 = 1/18
- 2/9 * 15/8 = - 30/72 = - 5 /12
15/66 - 10/44 = 30/132 - 30/132 = 0
2 + 3/4 = 11/4
7/15 - 1 = 7/15 - 15/15 = - 8/15
5/7 * 3 = 15/7
