Exercices

Résolutions d'équations

Correction exercice 4ème
Résoudre les cinq équations suivantes.
  • 3 + x = 1

    3 + x = 1 <=> x = 1 - 3 <=> x = - 2


  • -x - 2 = 2x + 1

    -x - 2 = 2x + 1 <=> - x - 2x = 1 + 2 <=> - 3x = 3 <=> x = - 1


  • -3x - 2 = 3 + 2x

    -3x - 2 = 3 + 2x <=> - 3x - 2x = 3 + 2 <=> - 5x = 5 <=> x = - 1


  • 3(x - 4) = 6x + 5

    3(x - 4) = 6x + 5 <=> 3x - 12 = 6x + 5 <=> 3x - 6x = 5 + 12 <=> - 3x = 17 <=> x = - 17/3


  • -(x + 2) = 5x - 1

    -(x + 2) = 5x - 1 <=> - x - 2 = 5x - 1 <=> - x - 5x = - 1 + 2 <=> - 6x = 1 <=> x = - 1/6