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Déterminer D_f l'ensemble de définition de la fonction f(x) = (1)/(2)x - 2 + (2)/(x).

Mathematics

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Graph of f(x) = 1/2x − 2 + 2/x

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Key points of f(x) = 1/2x − 2 + 2/x
Pointxy
Maximum−2−4
Minimum20

Exercice 2:

  1. a) Déterminer DfD_f l'ensemble de définition de la fonction ff.

    La fonction f(x)=12x−2+2xf(x) = \frac{1}{2}x - 2 + \frac{2}{x} est définie si et seulement si le dénominateur de la fraction 2x\frac{2}{x} n'est pas nul.

    x≠0x \neq 0

    L'ensemble de définition DfD_f est donc l'ensemble de tous les nombres réels, à l'exception de 0.

    Df=R∖{0}D_f = \mathbb{R} \setminus \{0\}

    En notation par intervalles:

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