Suite de nombres et intervale

Réponses à toutes vos questions après le Bac (Fac, Prépa, etc.)
yugolden
Membre Naturel
Messages: 18
Enregistré le: 27 Oct 2009, 13:48

suite de nombres et intervale

par yugolden » 02 Nov 2009, 12:44

bonjour j'ai cette suite: n=
et je dois justifier que: .

comment faire?
merci d'avance je suis perdu :mur:



alavacommejetepousse
Membre Irrationnel
Messages: 1667
Enregistré le: 28 Fév 2008, 16:23

par alavacommejetepousse » 02 Nov 2009, 12:52

bonjour minore le dénominateur

yugolden
Membre Naturel
Messages: 18
Enregistré le: 27 Oct 2009, 13:48

par yugolden » 02 Nov 2009, 12:55

je viens de STG, je ne sais pas ce que c'est que minorer, désolé.

alavacommejetepousse
Membre Irrationnel
Messages: 1667
Enregistré le: 28 Fév 2008, 16:23

par alavacommejetepousse » 02 Nov 2009, 13:04

n^2 +3n+1 >n^2

alavacommejetepousse
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Messages: 1667
Enregistré le: 28 Fév 2008, 16:23

par alavacommejetepousse » 02 Nov 2009, 13:04

on a n^2 +3n+1 >n^2

yugolden
Membre Naturel
Messages: 18
Enregistré le: 27 Oct 2009, 13:48

par yugolden » 02 Nov 2009, 13:29

c'est très gentil de m'aider, mais je vois pas du tout où cela me mène vraiment désolé

dudumath
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Messages: 417
Enregistré le: 18 Nov 2007, 11:04

par dudumath » 02 Nov 2009, 13:41

n^2 +3n+1 >n^2 signifie que 1/( n^2 +3n+1) < 1/n^2 donc en multipliant en haut et en bas par 4n tu obtiens ...

yugolden
Membre Naturel
Messages: 18
Enregistré le: 27 Oct 2009, 13:48

par yugolden » 02 Nov 2009, 13:48

j'obtiens 4n/4n(n²+3n+1)<4n/4n^3 ou encore 4n/(4n^3+12n^2+4n)<4n/4n^3

AbsovaAdots
Messages: 1
Enregistré le: 07 Avr 2012, 14:36

sony in ear dr dre beat box solo beat by dre

par AbsovaAdots » 07 Avr 2012, 14:39

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chan79
Membre Légendaire
Messages: 10330
Enregistré le: 04 Mar 2007, 19:39

par chan79 » 07 Avr 2012, 16:39

yugolden a écrit:bonjour j'ai cette suite: n=
et je dois justifier que: .

comment faire?
merci d'avance je suis perdu :mur:

salut
une autre façon:
=0 qui est toujours vrai

 

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