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dadkami15
@dadkami15
October 2020
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Bonjour, j’ai besoin d’aide pour cet exo svp :
Un est définie par U0=1/2
Et Un+1=Un^2-Un+1
Démontrer par récurrence que pour tout n, 1/2 =< Un < 1
Aide: utiliser les variations de la fonction f telle que Un+1 = f(Un)
Avec la récurrence, je trouve 5/4-k < Un+1 < 2-k mais sans connaitre k je ne peux savoir si 5/4-k est > 1/2 par exemple
Merci d’avance
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