Réponse:
exo 2
1. 4/40 = 1/10
2 35/70 = 5/10
3 30/100 = 3/10
4 45/30 = 9/6
5 9/6 = 90/60
6 70/42 = 10/6
7 64/32 = 8/4
8 20/24 = 5/6
exo 3
A = 40/56
B = 31/45
C = 52/18
D = 17/21
E = 47/16
F = 35/9
G = 19/15
H = 4/63
