Bonjour
A = 7/3 + 4/3 = 11/3
B = 2/5 - 8/5 = - 6/5
C = 7/12 + - 13/6 = 7/12 - (13 x 2) / (6 x 2) = 7/12 - 26/12 = - 19/12
D = - 1/9 + 3/5 = (- 1 x 5) / (9 x 5) + (3 x 9) / (5 x 9) = - 5/45 + 27/45 = 22/45
E = 3/42 - - 4/35 = (3 x 5) / (42 x 5) + (4 x 6) / (35 x 6) = 15/210 + 24/210 = 39/210.
