Je galère à faire ces exercices ''C'est l'histoire du si et seulement si'' besoin d'aide svp urgent  1) 3x -9 = 0
          x2

2) (25x - 45)  (x-8) = 0

3) (7 - x ) (x + 7) = 0

4) (8x - 16)² = 0
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