Répondre :
A=3(2x-1)-(2x-1)²
A=6x-3-(4x²-2x-2x+1)
A=6x-3-4x²+2x+2x-1
A= -4x²+10x-4
B=(3x+5)(x-2)-(x-2)²
B= 3x²-6x+5x-10-(x²-2x-2x+4)
B=3x²-6x+5x-10-x²+2x+2x-4
B=2x²+3x-14
A=6x-3-(4x²-2x-2x+1)
A=6x-3-4x²+2x+2x-1
A= -4x²+10x-4
B=(3x+5)(x-2)-(x-2)²
B= 3x²-6x+5x-10-(x²-2x-2x+4)
B=3x²-6x+5x-10-x²+2x+2x-4
B=2x²+3x-14