Bonsoir
B = - 3/8 - 5/12
B = (- 3 x 3) / (8 x 3) - (5 x 2) / (12 x 2)
B = - 9/24 - 10/24
B = - 19/24
C = - 5/12 + 7/18
C = (- 5 x 3) / (12 x 3) + (7 x 2) / (18 x 2)
C = - 15/36 + 14/36
C = - 1/36
D = - 7/6 - 11/12 + 5/9
D = (- 7 x 6) / (6 x 6) - (11 x 3) / (12 x 3) + (5 x 4) / (9 x 4)
D = - 42/36 - 33/36 + 20/36
D = - 55/36
E = (5/32 + 3/16) - (7/8 - 1/12)
E = [5/32 + (3 x 2) / (16 x 2)] - [(7 x 3) / (8 x 3) - (1 x 2) / (12 x 2)]
E = (5/32 + 6/32) - (21/24 - 2/24)
E = 11/32 - 23/24
E = (11 x 3) / (32 x 3) - (23 x 4) / (24 x 4)
E = 33/96 - 92/96
E = - 59/96
