Bonjour
C= 1/15+1/3-3/20
C = (1 x 4) / (15 x 4) + (1 x 20) / (3 x 20) - (3 x 3) / (20 x 3)
C = 4/60 + 20/60 - 9/60
C = 24/60 - 9/60
C = 15/60
C = (15 x 1) / (15 x 4)
C = 1/4.
bonjour
Merci de mettre profil collège et pas lycée
C= 1/15 + 1/3 - 3/20
= 4/6 + 20/60 - 9/60
= 15/60
= 1 /4
