Bonjour
A = 5/35 - 32/7 x 9/2
A = 5/35 - 288/14
A = (5 x 1) / (5 x 7) - (2 x 144) / (2 x 7)
A = 1/7 - 144/7
A = - 143/7
B = (9/5 + 2) / 8
B = [9/5 + (2 x 5) / (1 x 5)] : 8
B = (9/5 + 10/5) : 8
B = 19/5 x 1/8
B = 19/40
C = 3 - 4/7 x 5/12
C = 3 - 20/84
C = (3 x 21) / (1 x 21) - (4 x 5) / (4 x 21)
C = 63/21 - 5/21
C = 58/21
D = (3 + 5/4) / (6 - 2/7)
D = [(3 x 4) / (1 x 4) + 5/4] : [(6 x 7) / (1 x 7) - 2/7]
D = (12/4 + 5/4) : (42/7 - 2/7)
D = 17/4 : 40/7
D = 17/4 x 7/40
D = 119/160
