Réponses

  • Utilisateur Brainly
2012-05-22T10:17:39+02:00

 

A=5(2x-4)-3(-2x-5)=10x-20+6x+15=16x-5

^2= au carré

B=4x(-3x+4)+5x(7x-6)=-12x^2 +16x+35x^2-30x=27x^2-14x

C=3-5x(-7x+5)-(-2x^2-3x+8)=3+35x^2-25x+2x^2+3x-8=37x^2-22x-5

 D=(3+2x)(5+3x)-(2+3x)(6x-5)=15+9x+10x+6x^2-12x+10-18x^2+15x=-12x^2+22x+25