Réponses

2013-10-21T13:30:46+02:00
Exercice 1)
1) f5(x) =  e^{-5x}
2) IR
3) f'k(x) = -k  e^{-kx}
4) f'k(x) < 0
5)  \lim_{x \to \ + infty}  fk(x) =  \lim_{x \to \ +infty}  e^{-kx}  = 0 , \lim_{x \to \ -infty}  fk(x) =  \lim_{x \to \ -infty}  e^{-kx}  = +infinity