Changement de variable résolution équation svp 1ère Mathématiques


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  • Comment calculer le changement de variable ?

    a b h ( x ) dx = a b ( f ∘ φ ) ( x ) φ ′ ( x ) dx , on fait alors le changement de variable u = φ ( x ) : On applique à la fonction f le théorème. φ ( a ) et φ ( b ) .
    On obtient ainsi une nouvelle intégrale φ ( a ) φ ( b ) f ( u ) du égale à l'intégrale a b h ( x ) dx .

  • Comment déduire la résolution d'une équation ?

    1Additionner le même nombre aux deux membres de l'équation.
    2) Soustraire le même nombre aux deux membres de l'équation.
    3) Multiplier les deux membres de l'équation par un même nombre différent de zéro.
    4) Diviser les deux membres de l'équation par un même nombre différent de zéro.

  • Quand on fait le changement de variable ?

    On fait un changement de variable quand on peut mettre en évidence une expression de la forme w ′ ( u ( x ) ) × u ′ ( x ) ‍ dont une primitive est w ( u ( x ) ) ‍ .

  • Résoudre l'équation f(x) = g(x) consiste à déterminer tous les réels x de D qui ont la même image par f et par g.
    Propriété Graphiquement, les solutions de f(x) = g(x) sont les abscisses des points d'intersection des courbes représentatives de f et de g.
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Comment résoudre une équation de type A ?

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