Bonsoir,
A= 11/8+7/18×2/7
A = 11/8 + 14/126
A = 11/8 + (14 x 1) / (14 x 9)
A = 11/8 + 1/9
A = (11 x 9) / (8 x 9) + (1 x 8) / (9 x 8)
A = 99/72 + 8/72
A = 107/72
B= 7/15-2/15×9/4
B = (7 x 4) / (15 x 4) - 18/60
B = 28/60 - 18/60
B = 10/60
B = (10 x 1) / (10 x 6)
B = 1/6.
