Bonsoir
A = 7/3 - 4/3 : 8/5
A = 7/3 - 4/3 x 5/8
A = (7 x 8) / (5 x 8) - 20/24
A = 56/24 - 20/24
A = 36/24
A = (12 x 3) / (12 x 2)
A = 3/2
B = - 4/9 x 1/5 : 3/7
B = - 4/45 x 7/3
B = - 28/135
C = - 8/3 : - 5/6 + 7/4
C = - 8/3 x - 6/5 + 7/4
C = 48/15 + 7/4
C = (48 x 4) / (15 x 4) + (7 x 15) / (4 x 15)
C = 192/60 + 105/60
C = 297/60
C = (3 x 99) / (3 x 20)
C = 99/20
