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\devoir{1èreL}{5}{16 janvier 2012}{1h}




\begin{exercice} [(10 pts)]\par
Résoudre les équations suivantes :\par
 1) $-2x^2+9x-4=0$ \hspace{1cm} 2) $-\dfrac{3}{4}x^2+2x-5 = 0$ \hspace{1cm} 3) $25x^2-20x+4 = 0$ \par
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 4) $\dfrac{x}{2}-\dfrac{2}{x}=\dfrac{3}{2}$ \hspace{2.3cm}  5) $\dfrac{3x^2+10x+8}{x+2}=2x+5$
\end{exercice}


\begin{exercice} [(10 pts)]\par
Résoudre les inéquations suivantes :\par
 1) $x^2-8x+7 \geq 0$ \hspace{0,75cm} 2) $-3x^2+6x-3 \leq 0$ \hspace{1cm} 3) $2x^2-3x+6 > 0$ \par
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4) $-2x^2+4x+1 > -5x+8$  \hspace{0,75cm} 5) $(x-2)(2x-3) > (x-2)^2$
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