Réponse :
Explications :
Bonsoir,
g(x) = 2x+1(/x²-4)
On résout x² - 4 = 0
(x-2)(x+2) = 0
x - 2 = 0 ou x + 2 = 0
x = 2 ou x = -2
Dg = R \ { -2 ; 2 }
h(x) = 3/ 9-x²
On résout 9 - x² = 0
(3 - x)(3 + x) = 0
3 - x = 0 ou 3 + x = 0
x = 3 ou x = - 3
Dh = R \ { -3 ; 3 }
k(x)= 1+2/ (3-x)
On résout 3 - x = 0
x = 3
Dk = R \ { 3 }