Répondre :
P = -5x + 7 - 8 + 3x + x
= -x - 1
R = -4t² - 2t² + 3t - 1 - 2t + 3
= -6t² + t + 2
H = -3a(6 - 5a)
= -18a + 15a²
L = (-3 - n)(2n - 5)
= -n - 2n² + 15
E = 3x + 5x(4 - 2x) - 2(x² - 3x + 5)
= 3x + 20x - 10x² - 2x² + 6x - 10
= -12x² + 29x - 10
C = (4y - 1)(3y + 5) - (y - 7)
= 12y² + 17y - 5 - y + 7
= 12y² + 16y + 2
P= (-5x+7)-(8-3x)+x
P= -5x +7 -8 +3x +x
P= -x -1
R=-4t²-(2t²-3t+1)+(-2t+3)
R= - 4t² -2t² +3t -1 -2t +3
R= -6t² +t +2
Développe puis réduis si possible chaque expression
H=-3a(6-5a)
H = -18a +15a²
L=(-3-n)(2n-5)
L= -6n +15 -2n² +5n
L= -2n² -n +15
E=3x+5x(4-2x)-2(x²-3x+5)
E= 3x +20x -10x² -2x² +6x -10
E= -12x² +29x -10
C=(4y-1)(3y+5)-(y-7)
C= 12y² +20y -3y -5 -y +7
C= 12y² +16y +2
En espérant t'avoir aidé ...