Réponse :
1. 4/9 + 9/10 = 40/90 + 81/90 = 121/90
2. 20/10 + 20/10 = 40/10 = 4/1 = 4
3. 6/9 + 8/5 = 30/45 + 72/45 = 102/45 = 34/15
4. 6/2 + 8/3 = 18/6 + 16/6 = 34/6 = 17/3
5. 3/7 + 9/6 = 18/42 + 63/42 = 81/42 = 27/14
6. 7/10 + 3/8 = 28/40 + 15/40 = 43/40
7. 7/8 + 2/3 = 21/24 + 16/24 = 37/24
8. 7/4 + 5/3 = 21/12 + 20/12 = 41/12
9. 9/3 + 8/2 = 18/6 + 24/6 = 42/6 = 7/1 = 7
10. 6/10 + 4/5 = 6/10 + 8/10 = 14/10 = 7/5
