Bonsoir.
Réduire les expressions :
A = 3x+5+5x-6
A = 8x+5-6
A = 8x-1
B = -3x+5+x²-6
B = -3x-1+x²
B = x²-3x-1
C = 5×x-5×2-x²+6
C = 5x-10-x²+6
C = 5x-4-x²
C = -x²+5x-4
D = 2x×x-2x×6-x²+6x+2x
D = 2x²-2x×6-x²+6x+2x
D = 2x²-12x-x²+6x+2x
D = x²-12x+6x+2x
D = x²-4x
Bonne soirée.