Factorise puis réduit: C= (2x - 1)(x - 5)+(3x + 7)(x - 5) D= (2x + 5)(x - 3)+(2x + 5)(-3x + 1) E= (3x + 7)(2x - 9) - (3x + 7)(5x - 7) F= (-3x + 4)(3x - 8) - (-3

Bonsoir,

C= (2x - 1)(x - 5)+(3x + 7)(x - 5)
C = (x - 5)(2x - 1 + 3x + 7)
C = (x - 5)(5x + 6)

D= (2x + 5)(x - 3)+(2x + 5)(-3x + 1)
D = (2x + 5)(x - 3 - 3x + 1)
D = (2x + 5)(-2x - 2)
D = -2(2x + 5)(x + 1)

E= (3x + 7)(2x - 9) - (3x + 7)(5x - 7)
E = (3x + 7)(2x - 9 - 5x + 7)
E = (3x + 7)(-3x - 2)

F= (-3x + 4)(3x - 8) - (-3x + 4)(7x + 2)
F = (-3x + 4)(3x - 8 - 7x + 2)
F = (-3x + 4)(-4x - 6)
F = -2(-3x + 4)(2x + 3)

G= (8y + 3)(5y + 7) - 3 (8y + 3) (2y - 1)
G = (8y + 3)(5y + 7 - 3(2y - 1))
G = (8y + 3)(5y + 7 - 6y + 3)
G = (8y + 3)(-y + 10)