bonjour
A = 5/6 + 1/3 * 4/8 + 7/3
A = 5/6 + 4/24 + 7/3
A = 20/24 + 4/24 + 56/24
A = 80/24 = 10/3
B = 4/5 : 5/7 - 3/5
B = 4/5 * 7/5 - 3/5
B = 28/25 - 3/5
B = 28/25 - 15/25
B = 13/25
C = - 5/6 + 3/4 : 7/6 - 6/7
C = - 5/6 + 3/4 * 6/7 - 6/7
C = - 5/6 + 18/28 - 6/7
C = - 5/6 + 9/14 - 6/7
C = - 35/42 + 27/42 - 36/42
C = -50/42 = -25/21
D = 3/8 + 5/8 : 2/3 + 1/6
D = 3/8 + 5/8 x 3/2 + 1/6
D = 3/8 + 15/16 + 1/6
D = 18/48 + 45/48 + 8/48
D = 71/48