Mathématiques

Question

ÉQUATIONS ! :) 19 points à gagner :D
6x + 4(2 - 5x) = 7x 9 - 2x = -3(4 - x)
3(x + 1) = x + 6 -2(3x + 5) = 7 + x

MERCI D'AVANCE ! :b

1 Réponse

  • 6x + 4(2 - 5x) = 7x
    6x + 8 - 20x = 7x
    6x - 20x - 7x = - 8
    - 19x = - 8
    x = 8/19

    9 - 2x = -3(4 - x)
    9 - 2x = - 12 + 3x
    - 2x - 3x = - 12 - 9
    5x = 21
    x = 21/5
    x = 4,2

    3(x + 1) = x + 6
    3x + 3 = x + 6
    3x - x = 6 - 3
    2x = 3
    x = 3/2
    x = 1,5

    -2(3x + 5) = 7 + x
    - 6x - 10 = 7 + x
    - 6x - x = 7 + 10
    - 7x = 17
    x = 17/7

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