Sagot :
Bonjour,
A = (4y + 2)(5y + 3)
A = 20y² + 12y + 10y + 6
A = 20y² + 22y + 6
B = (-4y - 2)(-5y - 3)
B = 20y² + 12y + 10y + 6
B = 20y² + 22y + 6
C = 6(2x - 3)
C = 12x - 18
D = 5(-4x - 7)
D = -20x - 35
E = (-2a + 4b)(5a - 2b)
E = -10a² + 4ab + 20ab - 8ab
E = -10a² + 16ab
F = 3a - (2a - 3b)
F = 3a - 2a + 3b
F = a + 3b
G = (-2a + 4b)(-5c + 2d)
G = 10ac + 4ad - 20bc + 8bd
Réponse :
A = (4y + 2)(5y + 3)
A = 4y*5y + 4y*3 + 2*5y + 2*3
A = 20y² + 12y + 10y + 6
A = 20y² + 22y + 6
B = (-4y - 2)(-5y - 3)
B = -4y*(-5y) -4y*(-3) -2*(-5y) -2*(-3)
B = 20y² + 12y + 10y + 6
B = 20y² + 22y + 6
C = 6(2x - 3)
C = 6*2x - 6*3
C = 12x - 18
D = 5(-4x - 7)
D = 5*(-4x) - 5*7
D = -20x - 35
E = (-2a + 4b)(5a - 2b)
E = -2a*5a -2a*(-2b) + 4b*5a + 4b*(-2b)
E = -10a² + 4ab + 20ab - 8b²
E = -10a² + 24ab - 8b²
F = 3a - (2a - 3b)
F = 3a - 2a + 3b
F = a + 3b
G = (-2a + 4b)(-5c + 2d)
G = -2a*(-5c) -2a*2d + 4b*(-5c) + 4b*2d
G = 10ac - 4ad - 20bc + 8bd
Voilà j'espère t'avoir aidé !