Mathématiques

Question

EQUATION:
Résoudre les équations suivantes:

(1) 7x - 8 = 4x - 4

(2) 2x - 3 = -5x - 17

(3) 3(a - 5) = 4(3 - 2a)

(4) 5+ (6 - 2a) = (5a - 11) - (6 + 3a)

(5) 2x/3 = 5/2

(6) 5/3x = 2/5

Merci d'avance!

1 Réponse

  • Résoudre les équations suivantes :

    (1) 7x - 8 = 4x - 4
    7x - 4x = - 4 + 8
    3x = 4
    x = 4/3

    (2) 2x - 3 = -5x - 17
    2x + 5x = - 17 + 3
    7x = - 14
    x = - 14/7
    x = - 2

    (3) 3(a - 5) = 4(3 - 2a)
    3a - 15 = 12 - 8a
    3a + 8a = 12 + 15
    11a = 27
    a = 27/11

    (4) 5+ (6 - 2a) = (5a - 11) - (6 + 3a)
    5 + 6 - 2a = 5a - 11 - 6 - 3a
    - 2a - 5a + 3a = - 11 - 6 - 5 - 6
    - 4a = - 28
    a = 28/4
    a = 7

    (5) 2x/3 = 5/2
    4/6x = 15/6
    4x = 15
    x = 15/4

    (6) 5/3x = 2/5

    25/15x = 6/15
    25x = 6
    x = 6/25

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