Mathématiques

Question

exercice 1:

a.4x=-13.2

b.4-x=-13.2

c.x/4=-13.2

d.27-8x=33

e.9-2x=-5x+8

f.-2(3x-8)=-9+5x

 

2 Réponse

  • a. 4x = -13.2

    x = -3,3


    b.4-x = -13.2

    x = 9,2


    c.x/4 = -13.2


    d.27-8x = 33

    -8x = 6

    -x = 0,75


    e.9-2x = -5x+8

    -2x+5x = 8-9

    3x = -1

    x = 0,33333...


    f.-2(3x-8) = -9+5x

    -6x-5x = 16-9

    -11x = 7

    -x = 0,63636363636364 

  • a. 4x = -13.2

    4x/4=-13.2/4

    x = -3,3


    b.4-x = -13.2

    -4+4-x=-13.2-4

    -x*-1=9.2*-1

    x = -9,2


    c.x/4 = -13.2

    x/4*4 = -13.2*4

    x = 52,8


    d.27-8x = 33

    -27+27-8x=33-27

    -8x/8=6/8

    -x*(-1) = 0,75*(-1)

    x = -0,75


    e.9-2x = -5x+8

    +2x-8+9-2x=-5x+8+2x-8

    -3x/3=1/3

    -x*(-1) =  0,33333...*(-1)

    x =(environ egale)= -0.333


    f.-2(3x-8) = -9+5x

    -2*3x+(-2)*(-8) = -9+5x

    -5x-16-6x+16 = -9+5x-5x-16

    x = 25


    jespére que sa t'aura aidée d'avantage.

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