merci
Exercice 6
Etudier le signe de :

a) f(x) = 2x² + 3x - 9
d) k(x) = x-3+ 2/x
b) g(x) = - x² + x-3
e) 1(x) = 2x² + (4/x - 3)
c) h(x) = x - (1/x)
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