Bonjour,
A = - 5/6 + 1/18
A = (- 5 x 3) / (6 x 3) + 1/18
A = - 15/18 + 1/18
A = - 14/18
A = (2 x - 7) / (2 x 9)
A = - 7/9
B = 1/4 + 3/4 x 1/9
B = 1/4 + 3/36
B = (1 x 3) / (4 x 3) + (3 x 1) / (3 x 12)
B = 3/12 + 1/12
B = 4/12
B = (4 x 1) / (4 x 3)
B = 1/3
C = - 15/7 x - 4/5
C = 60/35
C = (5 x 12) / (5 x 7)
C = 12/7
D = 7/24 - 1/8
D = 7/24 - (1 x 3) / (8 x 3)
D = 7/24 - 3/24
D = 4/24
D = (4 x 1) / (4 x 6)
D = 1/6
E = 5/34 x (3/8 - 4/5)
E = 5/34 x [(3 x 5) / (8 x 5) - (4 x 8) / (5 x 8)]
E = 2/34 x (15/40 - 32/40)
E = 2/34 x (- 17/40)
E = - 34/1 360
E = (34 x - 1) / (34 x 40)
E = - 1/40.
F = 4/5 - 5/3 x 25/9
F = 4/5 - 125/27
F = (4 x 27) / (5 x 27) - (125 x 5) / (27 x 5)
F = 108/135 - 625/135
F = - 517/135
