[HELP] ! Jai besoin de votre aide ! :S

A= (2x+4)(x+1)+(x+2)(9x+7)
  = 2(x+2)(x+1)+(x+2)(9x+7)
  = (x+2)[2x+2+9x+1]
  A=(x+2)(11x+1)

B=5(1-x)+2x(x-1)
 B=(1-x)(5+2x)

C=3x²+12x+12
  =3(x²+4x+4)
   C=3(x+2)²

D= x²/4-25/9
D= (x/2-5/3)(x/2+5/3)