Répondre :
bonjour
7/3 - 4 /15 = 35/15 - 4/15 = 31 /15
3/2 + 6 /50 = 75/50 + 6/50 = 81/50
5/13 - 3 /130 = 50/130 - 3 /130 = 47/130
3/50 + 7 /50 = 10/50 = 1 /5
7/24 - 1 /6 = 7/24 - 4/24 = 3 /24 = 1 /8
5/42 + 5/6 = 5 /42 + 35/42 = 40/42 = 20 /21
5/9 + 1 /72 = 40/72 + 1 /72 = 41/72
1/5 + 1 /45 = 9 /45 + 1 /45 = 10 /45 = 2 /9
bonne journée