Bonjour,
A = 3/5 + 2/15
A = 9/15 + 2/15
A = 11/15
B = 4/36 + 5/6
B = 4/36 + 30/36
B = 34/36 = 17/18
C = 2/5 - 2/3 - 4/5
C = 6/15 - 10/15 - 12/15
C = -4/15 - 12/15
C = -16/15
D = 11/7 - 8/14 + 5/21
D = 33/21 - 4/7 + 5/21
D = 33/21 - 12/21 + 5/21
D = 21/21 + 5/21
D = 26/21
E = 2/9 - 2/18 + 5/6
E = 4/18 - 2/18 + 15/18
E = 2/18 + 15/18
E = 17/18
Tu essaies le dernier ? :)