Mathématiques

Question

Bonjour !! je n'arrive pas à faire ces équations, pourriez vous m'aider et me donner quelques explications?:/

1) 1= x/2 - 1/3
2) 3/2 x + 1/3 = 0
3) -3x/2 = - 2
4) -5x/3 + 2 = 5
5) -x/2 + 5 = -3
6) -7 = -7x + 7
7) x/4 + 4 = 1/4

Merci bcp !!!! 

1 Réponse

  • 1)
    1 =  x/2 - 1/3
    6/6 = 3x/6 - 2/6
    6 = 3x - 2
    3x =  6 + 2
    3x = 8
    x = 8/3

    2)
    3/2x + 1/3 = 0
    6/6x + 2/6 = 0
    6x = - 2
    x = -2/6
    x = - 1/3

    3)
    -3x/2 = - 2
    - 3x/2 = - 4/2
    - 3x = - 4
    x = 4/3

    4)
    -5x/3 + 2 = 5
    - 5x/3 + 6/3 = 15/3
     - 5x = 15 - 6
    5x = - 15 + 6
    5x = - 9
    x = - 9/5

    5)
     -x/2 + 5 = -3
    - x/2 + 10/2 = 6/2
    - x/2 = 6/2 - 10/2
    x = 10 - 6
    x = 4

    6)
    -7 = -7x + 7
    - 7 - 7 = - 7x
    7x = 7 + 7
    7x = 14
    x = 14/7
    x = 2

    7)
     x/4 + 4 = 1/4
    x/4 + 16/4 = 1/4
    x/4 = 1/4 - 16/4
    x = - 15

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