Bonjour,
E = 6/5 x 9/42
E = 54/210
E = (6 x 9) / (6 x 35)
E = 9/35
F = 20/7 x 14/15
F = 280/105
F = (35 x 8) / (35 x 3)
F = 8/3
G = 12/49 x 7/3
G = 84/147
G = (21 x 4) / (21 x 7)
G = 4/7
H = 45/4 x 4/5
H = 180/20
H = (20 x 9) / (20 x 1)
H = 9
I = 8 x 9/32
I = 72/32
I = (8 x 9) / (8 x 4)
I = 9/4
J = 3/4 x 4/3
J = 12/12
J = 1.