Mathématiques

Question

Boujours pouvez vous m aider :
a) 3-(5x+1)=8x+(4-2x)
b) 8-3(2x-4)=5x-(x+1)
c) 4(2x-6)-8=5-(x-7)

2 Réponse

  • a) 3-(5x+1)=8x+(4-2x)
    3-5x-1 = 8x+4-2x
    -5x -8x+2x = 4 -3+1
    - 11x = 2
    x = - 2/11


    b) 8-3(2x-4)=5x-(x+1)
    8 -6x+12 = 5x-x-1
    -6x -5x+x = -1 -8-12
    -10x = -21
    x = -21/-10
    x =21/10

    c) 4(2x-6)-8=5-(x-7)

    8x -24 -8 = 5x-35
    8x-5x = -35 +24+8
    3x = -3
    x = -3/3
    x = -1
  • a)
    3-(5x+1)=8x+(4-2x)
    3 - 5x - 1 = 8x + 4 - 2x
    - 5x - 8x + 2x = 4 - 3 + 1
    - 11x = 2
    x = - 2/11

    b)
    8-3(2x-4)=5x-(x+1)
    8 - 6x + 12 = 5x - x - 1
    - 6x - 5x + x = - 1 - 12 - 8
    - 10x = - 21
    x = 21/10

    c)
    4(2x-6)-8=5-(x-7)
    8x - 24 - 8 = 5 - x + 7
    8x + x = 7 + 24 + 8
    9x = 39
    x = 39/9

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