Bonjour,
A= 1/7 - 5/7
A = - 4/7
B= 1/2 + 5/6
B = (1 x 3) / (2 x 3) + 5/6
B = 3/6 + 5/6
B = 8/6
B = (2 x 4) / (2 x 3)
B = 4/3
C= 2/5 - 3/4
C = (2 x 4) / (5 x 4) - (3 x 5) / (4 x 5)
C = 8/20 - 15/20
C = - 7/20
D= 3/4 x 7/11
D = 21/44
E= -2/15 x -25/-6
E = - 50/90
E = (10 x - 5) / (10 x 9)
E = - 5/9
F= -4/7 : 5/-3
F = - 4/7 x - 3/5
F = 12/35
