Bonjour
D = 1/2 + 2/3
D = (1 x 3) / (2 x 3) + (2 x 2) / (3 x 3)
D = 3/6 + 4/6
D = 7/6
E = - - 3/4 + - 1/5
E = 3/4 - 1/5
E = (3 x 5) / (4 x 5) - (1 x 4) / (5 x 4)
E = 15/20 - 4/20
E = 11/20
F = - 6/7 + 3
F = - 6/7 + (3 x 7) / (1 x 7)
F = - 6/7 + 21/7
F = 15/7
G = - 7/6 + - 5/4
G = (- 7 x 2) / (6 x 2) - (5 x 3) / (4 x 3)
G = - 14/12 - 15/12
G = - 29/12
H = 5 - 14/24
H = (5 x 12) / (1 x 12) - (2 x 7) / (2 x 12)
H = 60/12 - 7/12
H = 53/12.
