Bonjour !
Développer:
A=5+4 (x+3)= 5+4x+12= 4x+17
B = 5x - 3(2x + 7)= 5x-6x-21= - x-21
C=-13-6 (3x - 2)= - 13-18x+12= - 18x-1
D=2x²-x (4 - 5x) + 3x= 2x²-4x+5x²+3x= 7x²-x
E =-3x (x-4) +2-8 (2x + 3)= -3x²+12x+2-16x-24= - 3x²-4x-22
F=5y-4 (4y - 3) +3 (−1+3y)= 5y-16y+12-3+9y= - 2y+9
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Bonjour !
Développer:
A=5+4 (x+3)= 5+4x+12= 4x+17
B = 5x - 3(2x + 7)= 5x-6x-21= - x-21
C=-13-6 (3x - 2)= - 13-18x+12= - 18x-1
D=2x²-x (4 - 5x) + 3x= 2x²-4x+5x²+3x= 7x²-x
E =-3x (x-4) +2-8 (2x + 3)= -3x²+12x+2-16x-24= - 3x²-4x-22
F=5y-4 (4y - 3) +3 (−1+3y)= 5y-16y+12-3+9y= - 2y+9