Mathématiques

Question

Aidez moi ! Équations ! ^^

A) -2 (3-2x) = x-8
B) 8(1+7x) = -3(5-2x)
C) 3-3(2x-7) = 2x-5(x-3)
D) 2x-3(2-2x) = 8(-x+1)+2
Merci d'avance :)

1 Réponse

  • A) -2 (3-2x) = x-8
    - 6 + 4x = x - 8
    4x - x = - 8 + 6
    3x = - 2
    x = - 2/3

    B) 8(1+7x) = -3(5-2x)
    8 + 56x = - 15 + 6x
    56x - 6x = - 15 - 8
    50x = - 23
    x = - 23/50
    x = - 0,46

    C) 3-3(2x-7) = 2x-5(x-3)
    3 - 6x + 21 = 2x - 5x + 15
    - 6x - 2x + 5x = 15 - 3 - 21
    - 3x = - 9
    x = 9/3
    x = 3

    D) 2x-3(2-2x) = 8(-x+1)+2
    2x - 6 + 6x = - 8x + 8 + 2
    2x + 6x + 8x = 8 + 2 + 6
    16x = 16
    x = 16/16
    x = 1

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