Bonjour,
D = - 5/7 - 2/3
D = (- 5 x 3) / (7 x 3) - (2 x 7) / (3 x 7)
D = - 15/21 - 14/21
D = - 29/21
E = - 9/2 + - 2/11
E = (- 9 x 11) / (2 x 11) - (2 x 2)/ (11 x 2)
E = - 99/22 - 4/22
E = - 103/22
I = - 7/6 + - 5/4
I = (- 7 x 2) / (6 x 2) - (5 x 3) / (4 x 3)
I = - 14/12 - 15/12
I = - 29/12
J = 19/20 - - 4/30
J = (19 x 3) / (20 x 3) + (4 x 2) / (30 x 2)
J = 57/60 + 8/60
J = 65/60
J = (5 x 13) / (5 x 12)
J = 13/12.