Bonjour
D = 5 x - 2/ - 5
D = 10/5
D = 2
E = - 7/6 x 7
E = - 49/6
F = - 2/4 x (- 2)
F = 4/4
F = 1
A = 15/14 x 7/25
A = 105/350
A = (35 x 3) / (35 x 10)
A = 3/10
B = 6/9 x 12/20
B = 72/180
B = (36 x 2) / (36 x 5)
B = 2/5
C = 30/15 x 16/40
C = 480/600
C = (120 x 4)/ (120 x 5)
C = 4/5
D = 48/10 x 5/36
D = 240/360
D = (120 x 2) / (120 x 3)
D = 2/3
E = 72/8 x 7/9
E = 504/72
E = 7
F = 6/8 x 4/3
F = 24/24
F = 1.