Bonjour
A = 2/9 + 4/3 - 4/6
A = (2 x 4) / (9 x 4) + (4 x 12) / (3 x 12) - (4 x 6) / (6 x 6)
A= 8/36 + 48/36 - 24/36
A = 56/36 - 24/36
A = 32/36
A = (4 x 8) / (4 x 9)
A = 8/9
B = (3/4 + 5/6) - (4/3 - 2/8)
B = [(3 x 6) / (4 x 6) + (5 x 4) / (6 x 4)] - [(4 x 8) / (3 x 8) - (2 x 3) / (8 x 3)]
B = (18/24 + 20/24) - (32/24 - 6/24)
B = 38/24 - 26/24
B = 12/24
B = (12 x 1) / (12 x 2)
B = 1/2.
