bonsoir

1/5 + 3/5 = 4/5

13/9 - 6/9 = 7/9

4/17 + 18/17 = 22/17

3/8 + 2/8 = 5/8

43/10 + 5/10 = 48/10 = 24/5

6/12 + 2/24 =  12/24 + 2/24 = 14 /24 = 7/12

6/5 + 2/15 = 8 /15

je ne vois pas le dernier