Bonjour
A = (5/3 - 4/7) : (5/2 + 6)
A = [(5 x 7) / (3 x 7)] - (4 x 3) / (7 x 3) : [5/2 + (6 x 2) / (1 x 2)]
A = (35/21 - 12/21) : (5/2 + 12/2)
A = 23/21 : 17/2
A = 23/21 x 2/17
A = 46/357
B = - 5 + 3 x [4/3 - (1 : (1 - 2/3)]
B = - 5 + 3 x [4/3 - (1 : [1 x 3) / (1 x 3) - 2/3)]
B = - 5 + 3 x [4/3 - (1 : (3/3 - 2/3)]
B = - 5 + 3 x [4/3 - (1 : 1/2)]
B = - 5 + 3 x [4/3 - (1 x 2)]
B = - 5 + 3 x (4/3 - 2)
B = - 5 + 3 x [4/3 - (2 x 3) / (1 x 3)]
B = - 5 + 3 x (4/3 - 6/3)
B = - 5 + 3 x (- 2/3)
B = - 5 - 6/3
B = - 5 - 2
B = - 7.
