Bonjour,
1)
10/5 = 2
2/12 = 1/6
-6/15 = -2/5
15/5 +2/5 = 17/5
2)
3/6 + 4/6 = 7/6
-4/10 +3/10 = -1/10
22/36 - 15/36 = 7/36
-9/21 -5/21 = -14/21 = -2/3
3)
8/12 +10/12 + 9/12 = 27/12 = 9/4
6/12 + 10/12 -7/12 = 9/12 = 3/4
- 64/12 - 24/12 +45/12 = -43/12
