Mathématiques

Question

Resoudre les équations

a) x-5=3 b) 9x-9=6x c) 7x+2=4x-7

d) 4(x+1)=2x-3 e) 5x+1=(3x-1)+(x-7)

2 Réponse

  • a ) x - 5 = 3
         x = 3 + 5
         x = 8

    b) 9 x - 9 = 6 x
        9 x - 6 x = 9
        3 x = 9
          x = 3

    c) 7 x + 2 = 4 x - 7
        7 x - 4 x = - 7 - 2
        3 x = - 9
            x = - 3

    d) 4 x + 4 = 2 x - 3
        4 x - 2 x = - 3 - 4
        2 x = - 7
           x = - 7/2

    e) 5 x +1 = 3 x - 1 + x - 7
        5 x - 3 x - x = - 1 - 7 - 1
           x = - 9


  • a ) x - 5 = 3     x = 3 + 5     x = 8
    b) 9 x - 9 = 6 x    9 x - 6 x = 9    3 x = 9      x = 3
    c) 7 x + 2 = 4 x - 7    7 x - 4 x = - 7 - 2    3 x = - 9        x = - 3
    d) 4 x + 4 = 2 x - 3    4 x - 2 x = - 3 - 4    2 x = - 7       x = - 7/2
    e) 5 x +1 = 3 x - 1 + x - 7    5 x - 3 x - x = - 1 - 7 - 1       x = - 9

Autres questions