Bonjour
A = 3/4 + 7/6 = (3 x 3) / (4 x 3) + (7 x 2) / (6 x 2) = 9/12 + 14/12 = 23/12
B = 9/10 + 5/8 = (9 x 4) / (10 x 4) + (5 x 5) / (8 x 5) = 36/40 + 25/40 = 61/40
C = 9/14 + 5/6 = (9 x 3) / (14 x 3) + (5 x 7) / (6 x 7) = 24/42 + 35/52 = 59/42
D = 5/6 + 1/8 = (5 x 4) / (6 x 4) + (1 x 3) / (8 x 3) = 20/24 + 3/24 = 23/24
E = 3/4 - 7/6 = (3 x 3) / (4 x 3) - (7 x 2) / (6 x 2) = 9/12 - 14/12 = - 5/12
F = 9/10 - 5/8 = 36/40 - 25/40 = 11/40
G = 9/14 - 5/6 = 24/42 - 35/42 = - 11/42
H = 5/6 - 1/8 = 20/24 - 3/24 = 17/24.
