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Une droite graduee est une droite possedant...
- une graduation;
- un sens;
- une origine (le point 0, note O);
-une unite
L'abscisse est le nombre qui permet de donner la position d'un point sur une droite graduee. Elle se note generalement Abs.
Deux nombres sont opposes s'ils ont des signes contraires et sont a la meme distance de l'origine droit graduee
Notation: l'oppose de (n) = -n
La valeur absolue d'un nombre est la valeur de la distance qui le separe de l'origine sur une droite graduee
Notation: la valeur absolue de n = |n|
Gut wissen:
-decroissant veut dire: les ordonne du plus grand au plus petit.
-croissant veut dire : les ordonne du plus petit au plus grand.
1.L'axe horisontal est celui des adscisses , note x
2.L'axe vertical est celui des ordonne ,note y
3.L'intersection des deux axes est appelee origine du repere, note O
4.Un tel repere du plan est un repere euclidien ou cartisesien. Ce repere, qui possede des axes perpendiculaisres ayant la meme unite ,est plus appele orthonorme .
5.Chaque point des coordones , par exmple:
6.L'absisse donne la position ,,gauche-droite'' On se deplace sur l'axe horizontale
7.L'ordonnee donne la position ,,haut-bas " On se deplace sur l'axe verticale
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