Bonsoir,
E = 4/15 : 2/3
E = 4/15 x 3/2
E = 12/30
E = (6 x 2) / (6 x 5)
E = 2/5
F = - 54/35 : 27/14
F = 54/35 x 14/27
F = 756/945
F = (189 x 4) / (189 x 5)
F = 4/5
G = - 24/11 : (- 6)
G = - 24/11 x - 1/6
G = - 24/66
G = (6 x - 4) / (6 x 11)
G = - 4/11.