Bonjour !
7/3 + 2/3 = 9/3 = 3
7/3 - 2/3 = 4/3
7/4 = 1 + 3/4
A : 1/5 + 3/5 = 4/5
B : 13/9 - 6/9 = 7/9
C : 4/17 + 18/17 = 22/17
D : 3/8 + 2/8 = 5/8
A : 5/7 - 9/14 = 10/14 - 9/14 = 1/14
B : 1/2 + 1/4 = 2/4 + 1/4 = 3/4
C : 1/2 - 1/6 = 3/6 - 1/6 = 2/6 = 1/3
D : 5/6 - 8,5/24 = 20/24 - 8,5/24 = 11.5/24
J'espère t'avoir aidé. Bon courage !
