Réponse :
Explications étape par étape
Bonjour
86 :
A = x - 4(3x + 2)
A = x - 4 * 3x - 4 * 2
A = x - 12x - 8
A = -11x - 8
B = (x - 2)(x - 3)
B = x * x - x * 3 - 2 * x - 2 * (-3)
B = x^2 - 3x - 2x + 6
B = x^2 - 5x + 6
C = 6 - 3(2x - 1)
C = 6 - 3 * 2x - 3 * (-1)
C = 6 - 6x + 3
C = -6x + 9
D = (5x - 4)(3x + 2)
D = 5x * 3x + 5x * 2 - 4 * 3x - 4 * 2
D = 15x^2 + 10x - 12x - 8
D = 15x^2 - 2x - 8
87 :
A = 3(x - 1/3)
A = 3x - 1
B = 2x(x/2 + 1)
B = x^2 + 2x
C = 2/5(5x + 15)
C = 2/5 * 5x + 2/5 * 15
C = 2x + 6
88 :
A = 4x - (2 - x)(x + 3)
A = 4x - (2x + 6 - x^2 - 3x)
A = 4x - 2x - 6 + x^2 + 3x
A = x^2 + 5x - 6
B = 3(x - 2)(2x + 5)
B = (3x - 6)(2x + 5)
B = 6x^2 + 15x - 12x - 30
B = 6x^2 + 3x - 30
C = 5x - (x + 1)(6x - 2)
C = 5x - (6x^2 - 2x + 6x - 2)
C = 5x - 6x^2 + 2x - 6x + 2
C = -6x^2 + x + 2
D = x(x - 1)(x + 2)
D = (x^2 - x)(x + 2)
D = x^3 + 2x^2 - x^2 - 2x
D = x^3 + x^2 - 2x
89 :
A = (2x + 3)(x^2 - 2x + 4)
A = 2x^3 - 4x^2 + 8x + 3x^2 - 6x + 12
A = 2x^3 - x^2 + 2x + 12
B = (x - 1)(x^2 + x + 1)
B = x^3 + x^2 + x - x^2 - x - 1
B = x^3 - 1
C = 2(x + 3)(x - 1) - (4 - x)(2x + 3)
C = (2x + 6)(x - 1) - (8x + 12 - 2x^2 - 3x)
C = 2x^2 - 2x + 6x - 6 - 8x - 12 + 2x^2 + 3x
C = 4x^2 - x - 12
D = (x + 1)(x - 2)(x + 3)
D = (x^2 - 2x + x - 2)(x + 3)
D = x^3 + 3x^2 - 2x^2 - 6x + x^2 + 3x - 2x - 6
D = x^3 2x^2 - 5x - 6
