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F-30
kExemple de résolution avec SOLVE
Exemple : Résoudre y = ax
2
+ b pour x quand y = 0, a = 1 et
b = –2.
MATH
Sf(Y)Ss(=)Sy(A)
S)(X)w+Se(B)
1)(,)S)(X)
1s(SOLVE)
Saisir ici la valeur de Y.
Valeur actuelle de Y
0=
1=
y2=
Valeur actuelle de X
=
Ecran de solution
•Pour interrompre une opération SOLVE en cours, appuyez sur
A.
Précautions lors de l’utilisation de SOLVE
Il peut être impossible d’obtenir une solution avec SOLVE à cause
de la valeur initiale (valeur supposée) de la variable solution. Dans
ce cas, essayez de changer la valeur initiale de la variable solution.
Il peut être impossible de déterminer la solution correcte avec
SOLVE, même s’il en existe une.
SOLVE emploie la formule de Newton, et même s’il existe plusieurs
solutions, une seule sera donnée.
Il peut être difficile d’obtenir des solutions avec la formule de
Newton pour les types de fonctions suivantes.
- Fonctions périodiques (y = sin(x), etc.)
- Fonctions dont la courbe contient une pente raide
(y = e
x
, y =1/x, etc.)
- Fonctions discontinues (y ='x, etc.)
Math
Math
Math
Math
Math
Math
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