Mathématiques

Question

math
résoudre les équations suivantes
c) 4-7y=10y
d) 7x+1=-4-x
a) 4(x+5)=10x+3
b) 3(x-2)=6(x+4)
e) 4y+3(4y-2)=3(y+1)

2 Réponse

  • c)  - 7 y - 10 y = - 4
        - 17 y = - 4
         y = 4/17

    d ) 7 x + x =  - 4 - 1
         8 x = - 5
         x = - 5/8

    a) 4 x + 20 = 10 x + 3
        4 x - 10 x = 3 - 20
        - 6 x = - 17
         x = 17/6

    b) 3 x - 6 = 6 x + 24
        3 x - 6 x = 24 + 6
        - 3 x = 30
         x = - 30/3 = - 10

    e ) 4 y + 12 y - 6 = 3 y + 3
          16 y - 3 y = 3 + 6
         13 y = 9
    y = 9/13

  • c) 4-7y=10y
    - 7y - 10y = - 4
    17y = 4
    x = 4/17

    d) 7x+1=-4-x
    7x + x = - 4 - 1
    8x = - 5
    x = - 5/8
    x = - 0,625

    a) 4(x+5)=10x+3
    4x + 20 = 10x + 3
    4x - 10x = 3 - 20
    - 6x = - 17
    x = 17/6

    b) 3(x-2)=6(x+4)
    3x - 6 = 6x + 24
    3x - 6x = 24 + 6
    - 3x = 30
    x = - 30/3
    x = - 10

    e) 4y+3(4y-2)=3(y+1)
    4y + 12y - 6 = 3y + 3
    4y + 12y - 3y = 3 + 6
    13y = 9
    y = 9/13

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