Sagot :
Salut !
A = -3x - x² + 1 - 5x + 2x² - 3
= -x² + 2x² - 3x - 5x + 1 - 3
= x² - 8x - 2
B = (2x + 3) - (5x - 3)
= 2x + 3 - 5x + 3
= 2x - 5x + 3 + 3
= -3x + 6
C = x² + (3x² + 2) - 5
= x² + 3x² + 2 - 5
= 4x² - 3
D = -(2x - 3) + (-x + 6)
= -2x + 3 - x + 6
= -2x - x + 3 + 6
= -3x + 9
je te laisse faire le dernier....
Bonjour,
A=−3x−x²+1−5x+2x²−3
=3x² -8x -2
B=(2x+3)−(5x−3)
=2x+3−5x+3
= -3x +6
C=x²+(3x²+2)−5
= 4x² -3
D=−(2x−3)+(−x+6)
-2x -3 -x +6
= -3x+3
E= x+(2x−1)−(3x+21)
x+2x−1−3x-21
= -22
