Bonjour
A = 3/4 : 2/5 + 4
A = 3/4 x 5/2 + 4
A = 15/8 + (4 x 8) / (1 x 8)
A = 15/8 + 32/8
A = 47/8
B = - 5/2 : 8/7 : (5/3 - 7/2)
B = - 5/2 x 7/8 : [(5 x 2) / (3 x 2) - (7 x 3) / (2 x 3)]
B = - 35/16 : (10/6 - 21/6)
B = - 35/16 : (- 11/6)
B = - 35/16 x (- 6/11)
B = 210/176
B = (2 x 105) / (2 x 88)
B = 105/88.
