Bonjour,
A = 2/5 + 4/3 x 9/7
A = 2/5 + 36/21
A = 2/5 + (3 x 12) / (3 x 7)
A = 2/5 + 12/7
A = (2 x 7) / (5 x 7) + (12 x 5) / (7 x 5)
A = 14/35 + 60/35
A = 74/35
B = 15/2 : 24/5
B = 15/2 x 5/24
B = 75/48
B = (3 x 25) / (3 x 16)
B = 25/16
C = (8 - 5/3) x (1/4 + 7/12)
C = [(8 x 3) / (1 x 3) - 5/3] x [(1 x 3) / (4 x 3) + 7/12]
C = (24/3 - 5/3) x (3/12 + 7/12)
C = 19/3 x 10/12
C = 190/36
C = (2 x 95) / (2 x 18)
C = 95/18.
D = 9/4 + 5
3 - 2/8
D = 9/4 + (5 x 4) / (1 x 4)
(3 x 8) / (1 x 8) - 2/8
D = 9/4 + 20/4
24/8 - 2/8
D = 29/4 : 22/8
D = 29/4 x 8/22
D = 232/88
D = (8 x 29) / (8 x 11)
D = 29/11.
