Mathématiques

Question

URGENT!! EQUATION :

Résoudre les équations suivantes:

(1) 3(a - 5) = 4(3 - 2a)

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

(3) 2x/3 = 5/2

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

1 Réponse

  • (1) 3(a - 5) = 4(3 - 2a)
    3a - 15 = 12 - 8a
    3a + 8a = 12 + 15
    11a = 27
    a = 27/11

    (2) 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

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

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

    15/15x = 6/15
    15x = 6
    x = 6/15
    x = 2/5

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