aider moi svp c'est le 48

A = 2/3 - 7/3 x 8/21
A = 2/3 - 56/63
A = 2 x 21 / 3 x 21 - 56/63
A = 42/63 - 56/63
A = - 14/63
A = 7 x - 2 / 7 x 9
A = - 2/9

B = (3/4 - 5/6) x 3/2
B = (3 x 6 / 4 x 6 - 4 x 4 / 6 x 4) x 3/2
B = (18/24 - 16/24) x 3/2
B = 2/24 x 3/2
B = 6/48
B = 6 x 1 / 6 x 8
B = 1/8

C = 11 + (2/3 - 5/2)
C = 11 + (2 x 2 / 3 x 2 - 5 x 3 / 2 x 3)
C = 11 + (4/6 - 15/6)
C = 11 - 11/6
C = 11 x 6 / 1 x 6 - 11/6
C = 66/6 - 11/6
C = 55/6

D = 3/7 - 15/7 + 5/24
D = - 12/7 + 5/24
D = - 12 x 24 / 7 x 24 + 5 x 7 / 24 x 7
D = -288/168 + 35/168
D = - 253/168

E = (11/7 - 2/5) x 24/7
E = (11 x 5 / 7 x 5 - 2 x 7 / 5 x 7) x 24/7
E = (55/35 - 14/35) x 24/7
E = 41/35 x 24/7
E = 984/245

F = 25/15 x (1/18 + 1/24)
F = 25/15 x (1 x 4 / 18 x 4 + 1 x 3 / 24 x 3)
F = 25/15 x (4/72 + 3/72)
F = 25/15 x 7/72
F = 175/1080
F = 5 x 35 / 5 x 216
F = 35/216