bonjour
B = 2/7 + 13/28 = 8/28 + 13/28 = 21/28
C = 1/4 + 7/6 - 5/12 = 3/12 + 14/12 - 5/12 = 12/12 = 1
D = 5/7 + 9/7 - 7/7 = 7/7 = 1
7/15 * 4/15 * 3/2 = 84/450 = 14/75
1/24 + 1/3 = 1/24 + 8/24 = 9/24
vélo = 15/24
matin = 3/4
reste 1/4 à midi
AM = 1/4 x 2/3 = 2/12 = 1 /6
vendu = 3/4 + 1/6 = 9/12 + 2/12 = 11 /12
reste le soir 1/12