Bonsoir
A = 5/9 - 7/4 x 16/42
A = 5/9 - 112/168
A = 5/9 - (56 x 2) / (56 x 3)
A = 5/9 - 2/3
A = 5/9 - (2 x 3) / (3 x 3)
A = 5/9 - 6/9
A = - 1/9
B = 3 - 5/2 : 25/4
B = 3 - 5/2 x 4/25
B = 3 - 20/50
B = (3 x 5) / (1 x 5) - (10 x 2) / (10 x 5)
B = 15/5 - 2/5
B = 13/5
C = (- 1/36 + 1 - 11/6) / (- 1/36 - 1 + 11/6)
C = [- 1/36 + (1 x 36) / (1 x 36) - (11 x 6) / (6 x 6)] / [- 1/36 - (1 x 36) / (1 x 36) + (11 x 6) / (6 x 6)
C = (- 1/36 + 36/36 - 66/36) / (- 1/36 - 36/36 + 66/36)
C = - 28/36 : 29/36
C = - 28/36 x 36/29
C = - 1 008/1 044
C = (36 x - 28) / (36 x 29)
C = - 28/29
D = 13/8 - (3/4 - 3/32) x 3
D = 13/8 - [[3 x 8) / (4 x 8) - 3/32] x 3
D = 13/8 - (24/32 - 3/32) x 3
D = 13/8 - 21/32 x 3
D = (13 x 4) / (8 x 4) - 63/32
D = 52/32 - 63/32
D = - 11/32.
