Bonjour,
Exercice 3
2/3 de 45
(2*45)/3 => 30 km de montée
Exercice 4
A= 10/35 + 42/35 = 52/35
B= 49/70 - 90/70 = -41/70
C= 40/60 + 45/60 + 48/60
= 133/60