/9.Bonjour
D = 4 + 3/4 = (4 x 4) / (1 x 4) + 3/4 = 16/4 + 3/4 = 19/4
E = 5/9 - 2/3 = 5/9 - (2 x 3) / (3x 3) = 5/9 - 6/9 = - 1/9
F = 7/6 - 13/30 = (7 x 5) / (6 x 5) - 13/30) = 35/30 - 13/30 = 22/30 = (2 x 11) / (2 x 15) = 11/15
G = 2 - 4/7 = (2 x 7) / (1 x 7) - 4/7 = 14/7 - 4/7 = 10/7
H = 8/9 - 5 = 8/9 - (5 x 6) / (1 x 9) = 8/9 - 30/9 = - 22/9.