This mathematics problem involves applying core mathematical principles and formulas. Below you will find a complete step-by-step solution with detailed explanations for each step, helping you understand not just the answer but the method behind it.

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Exercice 1:
Pour que la fonction soit définie, le dénominateur de la fraction ne doit pas être nul. L'ensemble de définition est donc l'ensemble de tous les nombres réels, à l'exception de et . En notation par intervalles:
L'ensemble de définition est .
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Exercice 1: 1. Déterminer D_f l'ensemble de définition de la fonction f.
This mathematics problem involves applying core mathematical principles and formulas. Below you will find a complete step-by-step solution with detailed explanations for each step, helping you understand not just the answer but the method behind it.