Réponses

  • Utilisateur Brainly
2013-01-30T21:04:40+01:00

A = 12x-4 +15x²+5x-21x-7=15x²-4x-11

 

B= -4x²+3x-20x+15+6x²+15x-8x-20= 2x² -10x -5

 

C= 16x²-56x+49

 

D=6x²-10x+21x-35-(5x²-x-15x+3)=x²+27x-38