Réponses

2012-11-26T18:21:49+01:00

A = 7x-11x-4(x+2)

A = 7x-11x-4x-8

A = -8x-8

 

B = 3x² + 12x(6-4x) - 9x²

B = 3x²+72x-48x²-9x²

B = -54x²+72x


C =  (5x + 3) (4x + 2)-(6 - 2x) (-5x + 4 )

C = (20x²+10x+12x+6)-(-30x+24+10x²-8x)

C = 20x²+10x+12x+6+30x-24-10x²+8x

C = 10x²+60x-18