Bonjour Nono610
Exercice IV
[tex]a)\ Si\ x^2\in\ ]4;25[,\ alors\ \boxed{x\in\ ]-5;-2[\ \cup\ ]2;5[}\\\\b)\ Si\ x^2\ \textgreater \ 5,\ alors\ \boxed{x\in\ ]-\infty;-\sqrt{5}[\ \cup\ ]\sqrt{5};+\infty[}\\\\c)\ Si\ -3\ \textless \ x\ \textless \ -1,\ alors\ \boxed{-1\ \textless \ \dfrac{1}{x}\ \textless \ -\dfrac{1}{3}}\\\\d)\ Si\ 4\ \textless \ \dfrac{1}{x}\ \textless \ 6,\ alors\ \boxed{\dfrac{1}{6}\ \textless \ x \ \textless \ \dfrac{1}{4}}[/tex]
