Bonjour
2/3 + 5/3 = (2+5)/3 = 7/3
17/9 - 4/9 = ( 17-4)/9 = 13/4
3/11 + 4/11 = (3+4)/11 = 7/11
-15/17 + 7/17 = (-15 + 7 ) / 17 = - 8/17
Bonne journée
