Bonjour,
Supprime les parenthèses puis réduis chaque expression :
A = 8+(2x+5)
A = 8+2x+5
A = 13+2x
B = 3x-(2-4x)
B = 3x-2+4x
B = 7x-2
C = (x-6)-6
C = x-6-6
C = x-12
D = (7x+2)+(-6x-2)
D = 7x+2-6x-2
D = 7x-6x
D = x
E = -(-3x-1)+(x-4)
E = 3x+1+x-4
E = 4x+1-4
E = 4x-3
F = 8x-(5x+7)+(1-4x)
F = 8x-5x-7+1-4x
F = -x-7+1
F = -x-6
Bonne journée.