Mathématiques

Question

aider moi stp
résoudre les équations
a) x-4=0
b)-4y+3=-5
c)8y-3=5(2y-3)+6
d)4x=6
e)3x+7=-2x-8
f)10x-2=0
g)4-7b=2b+11
h)3(2x-4)=9-3(x-5)

2 Réponse

  • A) x-4 = 0
    A) x = 4 

    D) 4x = 6
    D) 4x/4 = 6/4
    D) x = 3/2

    F) 10x - 2 = 0
    F) 10x = 2
    F) 10x/10 = 2/10 
    F) x = 1/5

    G) 4-7b = 2b+ 11
    G) -9b = 7
    G) -9b/9 = 7/9
    G) -b = 7/9
    G) b = 7/9




  • a) x-4=0
    x=4

    b)-4y+3=-5
    -4y=-5-3
    -4y=-8
    y=-8/-4
    y=2

    c)8y-3=5(2y-3)+6
    8y-3=5*2y+5*(-3)+6
    8y-3=10y-15+6
    8y-10y=-15+6+3
    -2y=-6
    y=-6/-2
    y=3

    d)4x=6
    x=6/4
    x=1.5

    e)3x+7=-2x-8
    3x+2x=-8-7
    5x=-15
    x=-15/5
    x=-3

    f)10x-2=0
    10x=2
    x=2/10
    x=0.2

    g)4-7b=2b+11
    -7b-2b=11-4
    -9b=7
    b=7/-9
    b=-7/9

    h)3(2x-4)=9-3(x-5)
    3*2x+3*(-4)=9-3*x-3*(-5)
    6x-12=9-3x+15
    6x+3x=9+15+12
    9x=36
    x=36/9
    x=4

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