Réponse:
7/8+1/4= 7/8+2/8=9/8
1/6+3/2=1/6+9/6=10/6=5/3
3/6+5/4=12/24+30/24=42/24=7/4
5/3+1/8=40/24+3/24=43/24
5/9+7/6=30/54+63/54=93/54
