Bonjour,
A = - 5/8 + 7/12
A = (- 5 x 6) / (8 x 6) + (7 x 4) / (12 x 4)
A = - 30/48 + 28/48
A = - 2/48
A = (2 x - 1) / (2 x 24)
A = - 1/24
B = - 14/12 x 18/35
B = - 252/420
B = (84 x - 3) / (84 x 5)
B = - 3/5
C = 1/2 - 1/5 : 6
C = 1/2 - 1/5 x 1/6
C = 1/2 - 1/30
C = (1 x 15) / (2 x 15) - 1/30
C = 15/30 - 1/30
C = 14/30
C = (2 x 7) / (2 x 15)
C = 7/15
D = (3/4 - 2/5) / (2 + 1/3)
D = [(3 x 5) / (4 x 5) - (2 x 4) / (5 x 4)] / [(2 x 3) / (1 x 3) + 1/3]
D = (15/20 - 8/20) : (6/3 + 1/3)
D = 7/20 : 7/3
D = 7/20 x 3/7
D = 21/140
D = (7 x 3) / (7 x 20)
D = 3/20
E = 1/3 : (2 - 3/7)
E = 1/3 : [(2 x 7) / (1 x 7) - 3/7]
E = 1/3 : (14/7 - 3/7)
E = 1/3 : 11/7
E = 1/3 x 7/11
E = 7/33
