Réponses

2012-12-16T14:57:16+01:00

J = 7x au carré + 14 x - 6x au carré

J = x au carré + 14 x

 

K = xy - 2y + xy

K = 2xy - 2y

 

L = 6x + 10 x au carré + 56x - 8x au carré + 4x -4

L = 2x au carré + 64x - 4

2012-12-16T15:06:58+01:00

J= 7x(x+2)-6x²

=7x*x+7x*2-6x²

=7x²+14x-6x²

=x²+14x

 

K= x(y-2)+xy

=x*y+x*(-2)+xy

=xy-2x+xy

=2xy-2x

 

L= 2x ( 3 + 5 x ) + 8 x ( 7 - x ) + 4 ( x-1)

=2x*3+2x*5x+8x*7+8x*(-x)+4*x+4*(-1)

=6x+10x²+56x+(-8x²)+4x-4

=2x²+66x-4