Répondre :
G=-(4x-3) + (5x-2)
= -4x+3+5x-2
= x+1
H= 2(3x-5) - 5 ( 12 - 4,5x )
= 6x-10 -60+22.5x
= 28.5x-70
G = - (20x²-8x -15x+6)
= -20²+8x+15x-6
= -20x² +23x -6
H = 6x-10 -(60-22.5x)
H = 6x -10 -60+22.5x
= 28.5x -70
Développer en suprimant les parenthèses puis en réduire chacune des expréssions :
G=-(4x-3) + (5x-2)
H= 2(3x-5) - 5 ( 12 - 4,5x )
G=-(4x-3) + (5x-2)
= -4x+3+5x-2
= x+1
H= 2(3x-5) - 5 ( 12 - 4,5x )
= 6x-10 -60+22.5x
= 28.5x-70
G = - (20x²-8x -15x+6)
= -20²+8x+15x-6
= -20x² +23x -6
H = 6x-10 -(60-22.5x)
H = 6x -10 -60+22.5x
= 28.5x -70