Exercices

Développements d'expressions littérales

Correction exercice 5ème
Développer les expressions suivantes :
  • A = 5(2 + x)

    A = 5(2 + x) = 5 × 2 + 5 × x = 10 + 5x


  • B = 2 + 1(4 + 3x) - 3x

    B = 2 + 1(4 + 3x) - 3x = 2 + 4 + 3x - 3x = 6


  • C = 5(x + 1) + 3

    C = 5(x + 1) + 3 = 5x + 5 + 3 = 5x + 8


  • D = (3 + 2x) × 5 - x

    D = (3 + 2x) × 5 - x = 3 × 5 + 2x × 5 - x = 15 + 10x - x = 15 + 9x


  • E = x + 3x + 5x(4 - 1) + 3 × (2 - x)

    E = x + 3x + 5x(4 - 1) + 3 × (2 - x) = x + 3x + 5x × 3 + 6 - 3x = x + 3x + 15x + 6 - 3x = 16x + 6