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Ornela1803
@Ornela1803
May 2019
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Bonjour ! J'ai besoin d'aide svp pour 2 exercices merci d'avance :) (voir pièce jointe)
Ou j'en suis :
Pour l’exercice 2 , 1)x varie entre 0 et 20
2)V=100x
Après je suis bloqué aidez moi svp
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1) |x|-3≠0
x≠-3 ou x≠3
Df= R\{-3 ; 3}
2)f(-x)=( (-x)²-9 ) / ( |-x|-3 )
f(-x) = ( x²-9 ) / ( |x|-3 ) = f(x) fonction paire
3) pour x≥0 f(x) = ( x²-9 ) / ( x-3 ) = ( (x-3)(x+3) ) / (x-3)
f(x) = x+3
fonction croissante
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x≠-3 ou x≠3
Df= R\{-3 ; 3}
2)f(-x)=( (-x)²-9 ) / ( |-x|-3 )
f(-x) = ( x²-9 ) / ( |x|-3 ) = f(x) fonction paire
3) pour x≥0 f(x) = ( x²-9 ) / ( x-3 ) = ( (x-3)(x+3) ) / (x-3)
f(x) = x+3
fonction croissante