Bonjour, C= 1/15+1/3-3/20

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