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quelqu'un pourrait-il m'aider?(prob de mathématique)

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Messagepar Mushee » Mer Oct 07, 2009 8:36 pm

Ah non c'est vrai, ton sommet c'est (h,k), pas (x,y)
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Messagepar Mushee » Mer Oct 07, 2009 8:41 pm

Je coince, j'ai pas de calculatrice graphique pour résoudre une équation euh.. j'ai oublié le nom
Celle du style x²+x+1
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Messagepar -Prada » Mer Oct 07, 2009 8:43 pm

Il faut que je résoude un système d'équation pour montrer que le sommet est (0,0)...
Si je remplace y par 0 et x par 0.

Par exemeple, si j'ai (3,0) , (4,50) (12,150) comme coordonnées je dois :

1. inverser mes coordonnées ce qui donne ( 0,3), (50,4)....

2. f(x)=ax²+bx+c ----------> f(x)=ax²+bx+3

4=(50)²+b(50)+3 que je résoud par réduction avec 12=a(150)²+b(150)+3...


Mais dans mon cas avec ma fonction je ne peux pas faire ça puisque une des mes coordonnées m'amène à :

0=0a+0b+0... je ne peux donc pas faire de réduction. j'espère que c'est clair ce que j'essaye de dire..

Quoi que au point où j'suis rendu j'suis à la veille de remplacer x et y par 0... je ne sais pas quoi faire :roll:
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Messagepar -Prada » Mer Oct 07, 2009 8:46 pm

Bein moi j'ai une calculatrice graphique mais elle ne me donne pas les démarches... :lol: :roll:
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Messagepar Mushee » Mer Oct 07, 2009 8:46 pm

Jme souviens pas comment résoudre ca a la mitaine.. ca se fait me semble?
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Messagepar -Prada » Mer Oct 07, 2009 8:49 pm

Oui ça se fait si j'ai 2 équations.. mais là avec mon point (0,0) ça fait comme disparaitre une de mes équations.. donc je me retrouve avec une seule équation pour résoudre un système d'équations (?!).

Je déteste les maths par moments :roll:
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Messagepar invité1 » Jeu Oct 08, 2009 7:52 am

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Messagepar manny » Jeu Oct 08, 2009 8:03 am

manny et Pooky ( cockatiel)
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Messagepar Audrey & Xati » Jeu Oct 08, 2009 8:11 am

Audrey & Xati.
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Messagepar heavenly » Jeu Oct 08, 2009 3:11 pm

°¤°JaCkO eT PeNnY gRiS D'aFrIqUe°¤°
¤°¤TwIcK cOnUrE à JoUe VeRtE¤°¤
°¤°VoLcOm CoNuRe NaNdAy°¤°
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Messagepar -Prada » Jeu Oct 08, 2009 7:23 pm

-Prada
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Messagepar celtine » Jeu Oct 08, 2009 8:20 pm

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