bonjour
A = 5/6 + 2/3 = 5/6 + 4/6 = 9 /6 = 3 /2
B = 13/25 - 2/5 = 13/25 - 10/25 = 3 /25
C = 1 - 7/12 = 12/12 - 7/12 = 5/12
D = 2 + 13/12 = 24/12 + 13 /12 = 37/12
