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Insertion de n moyen géométrique
Domaine Science Sous domaine Mathématiques
Section Scientifique Option Math-Physique
Discipline Mathématique Classe 6ème
Matériel didactique La voie Auteur SCHOOLAP.COM
Objectif opérationnel A l'issue de la leçon, l'élève sera capable de déterminer l'insertion de n moyen géométrique à l'acide de la formule de la raison géométrique en 5 minutes.
Réference Algèbre 5e sc, cours et exercice, J.M. Makiadi, pp. 152-153.
Activité initiale

a. Rappel 

Déterminez trois nombres en P.G sachant que leur produit égale 3375 et leur somme égale 65 ?

b. Motivation

Que faut-il faire pour trouver une P.G?

b. Motivation

Pour trouver une P.G, il faut calculer sa raison.

En calculant la raison, qu'est-ce qu'on cherche ?

En calculant la raison, on insère la P.G

c. Annonce du sujet

Qu'allons nous étudier aujourd'hui en math ?

c. Annonce du sujet

Aujourd'hui nous allons étudier l'insertion de n moyen géométrique.

Activité principale

Que faut-il faire pour insérer n moyen géométrique ?

Pour insérer n moyen géométrique entre deux termes a et B , il suffit de calculer la raison q.

Exemple : insérez trois moyens géométriques entre 2 et 200.

Résolution

La P.G : 2, 210,20,210,200.

Partagez 195 en trois parties formant une P.G sachant que la troisième partie dépasse la première de 120 ?

Résolution

Soient t1, t2, t3 les trois parties.

{t1+t2+t3=195t3=t1+120= {t1+t1.t3+t1.q2=195t1.q2=t1+120

{t1(1+q+q3)=125(1)t1(q21)=120(2)t1=120q21(3)

(3) dans (1) 120q21(1+q+q2)=195

5q2-8q-21=0

∆=64-4(5)(-21)=64

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