Mathématiques

Question

Bonjour,

Pourriez vous m'aider pour cette exercice de maths ?

a) 3x + 7 = x + 2

b) 2+ 2y = -1 + 3y

c) 4- 5a = 2a - 1

d) t- 4 = -3t - 10

2 Réponse

  • a) 3x + 7 = x + 2
    3x - x = 2 - 7
    2x = - 5
    x = - 5/2
    x = - 2,5

    b) 2+ 2y = -1 + 3y
    2y - 3y = - 1 - 2
    - y = - 3
    y = 3

    c) 4- 5a = 2a - 1
    - 5a - 2a = - 1 - 4
    - 7a = - 5
    a = 7/5
    a = 1,4

    d) t- 4 = -3t - 10

    t + 3t = - 10 + 4
    4t = - 6
    t = - 6/4
    t = - 3/2
    t = - 1,5
  • a) 3x + 7 = x + 2
    3x-x = 2-7
    2x = -5
    x = -5/2

    b) 2+ 2y = -1 + 3y
    2y-3y = -1-2
    -y = -3
    y = 3

    c) 4- 5a = 2a - 1
    -5a-2a = -1-4
    -7a = -5
    a = -5/-7
    a = 5/7

    d) t- 4 = -3t - 10

    t+3t = -10+4
    4t = -6
    t = -6/4
    t = -3/2

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