Répondre :

A=(4x+1)(x-4)-4x(1-5x)
  =4x²-16x+x-4+20x²-4x
  =24x²-19x-4

B=2x(3x-1)-(1-4x) (1/2x+1)
  =6x²-2x-(-2x²+1+1/2x-4x)
  =8x²+3/2x-1
A = (4x+1)(x-4)-4x(1-5x)
   = 4x²-16x+x-4-4x+20x²
   =24x²-19x-4
B = 2x(3x-1)-(1-4x)(1/2x-1)
   = 6x²-2x-(1/2x-1-2x²+4x)
   = 6x²-2x-1/2x+1+2x²-4x
   =8x²-13/2x+1

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