Bonjour
A = - 3/5 + 9/20
A = (- 3 x 4) / (5 x 4) + 9/20
A = - 12/20 + 9/20
A = - 3/20
B = 5/12 - 3/8
B = (5 x 2) / (12 x 2) - (3 x 4) / (8 x 4)
B = 10/24 - 12/24
B = - 2/24
B = (2 x - 1) / (2 x 12)
B = - 1/12
C = - 2 - - 4/3
C = (- 2 x 3) / (1 x 3) + 4/3
C = - 6/3 + 4/3
C = - 2/3
D = - 3/10 x - 2/7
D = 6/70
D = (2 x 3) / (2 x 35)
D = 3/35
E = 3/4 x 12/7
E = 36/28
E = (4 x 9) / (4 x 7)
E = 9/7
F = 3 x - 2/- 9
F = 6/9
F = (3 x 3) / (3 x 3)
F = 3/2
G = - 8/9 : 7/4
G = - 8/9 x 4/7
G = - 32/63
H = 11/3 + - 5/4
H = 11/3 x - 4/5
H = - 44/15
I = - 2/3 : - 10/7
I = - 2/3 x - 7/10
I = 14/21
I = (7 x 2) / (7 x 3)
I = 2/3
