Réponses

2012-05-27T18:56:07+02:00

A=-5(x-2)

  = -5x+10

 

B=(3x+5)(x+4)

  =3x²+12x+5x+20

  =3x²+17x+20

 

C=(9+x)(4x-1)

  =36x-9+4x²-x

 =4x²+35x-9

 

D=(7x-2)(5x-3)

  =35x²-21x-10x+6

  =35x²-31x+6

 

A-B+C-D

=-5x+10-(3x²+17x+20)+4x²+35x-9-(35x²-31x+6)

=-5x+10-3x²-17x-20+4x²+35x-9-35x²+31x-6

=-34x²+44x-25