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**Exercices complémentaires**

1. **Résolution d'un système linéaire:**
   \[
   \begin{align*}
   2x + 3y &= 7 \\
   4x + 5y &= 11
   \end{align*}
   \]

2. **Résolution d'une équation quadratique:**
   \[
   x^2 - 3x + 2 = 0
   \]

3. **Équation exponentielle:**
   \[
   3^x = 81
   \]

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The image shows mathematical exercises, including a linear system, a quadratic equation, and an exponential equation.

This page provides solutions to a set of mathematical exercises, including a linear system, a quadratic equation, and an exponential equation. The solutions cover key concepts such as Gaussian elimination, the quadratic formula, and laws of exponents. Suitable for students in Grades 9-11.

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