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besoin d'aide, de cconseil,dun bon cour, cest ici a bas prix

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jai eu sa au brevet et au bac et savoir que javais appris grace a ma fiche de révision ma soulagé , vrm jai eu 15 omg!!!

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Maths
@avoirsonbrevet



Thales
Le théorème de Thalès est un résultat fondamental
en géométrie qui établit une relation entre les
longueurs des segments d'un triangle et des droites
parallèles qui les coupent.
Énoncé du théorème de Thalès :
Si trois droites parallèles coupent deux droites
sécantes, alors les segments obtenus sur les droites
sécantes sont proportionnels.
Formulation algébrique :
Soit ABC un triangle, avec (DE) et (FG) deux droites
parallèles qui coupent les côtés du triangle en D, E, F,
G respectivement. On a alors :
AD/DB = AE/EC = AF/FC = AG/GC
Utilisation du théorème de Thalès :
- Pour trouver une longueur inconnue :

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