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lolo62270
@lolo62270
June 2021
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Ex 1 résoudre les équations suivantes :
3(x+2)+(x-2)=0 3(x+2)(2x-3)=0
Ex 2 On a calculé, en colonne B, les valeurs prises par l'expression pour les valeurs de inscrites en colonne A.
On souhaite résoudre l'équation d'inconnue :
1. Margot dit que le nombre 2 est solution.
A-t-elle raison? Justifier la réponse.
2. Léo pense que le nombre 18 est solution.
A-t-il raison ? Justifier la réponse.
3. Peut-on trouver une autre solution ?
Justifier la réponse.
le tableau
A B
x x²+x-2
-5 18
-4 10
-3.5 6.75
-3 4
-2 0
-0.5 -2.25
0 -2
1 0
1.5 1.75
2 4
3.5 13.75
4 18
4.5 22.75
5 28
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