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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 6: tìm x biết (x e z) x + 35 = 14 x – 27 = – 85 x + 18 = (-2)^3 x 5 3x – 5 = -125 (-6)x + 1 = 3^3 3x – (x+5) = -27

Toán Lớp 6: tìm x biết (x e z)
x + 35 = 14
x – 27 = – 85
x + 18 = (-2)^3 x 5
3x – 5 = -125
(-6)x + 1 = 3^3
3x – (x+5) = -27

Comments ( 2 )

  1. a)
    x+35=14
    x=14-35
    x=-21
    b)
    x-27=-85
    x=-85+27
    =-58
    c)
    x+18=(-2)^3xx5
    x+18=-8xx5
    x+18=-40
    x=-40-18
    x=-58
    d)
    3x-5=-125
    3x=-125+5
    3x=-120
    x=-120:3
    x=-40
    e)
    -6x+1=3^3
    -6x+1=27
    -6x=27-1
    -6x=26
    x=26:(-6)
    x=13/(-3)
    f)
    3x-(x+5)=-27
    3x-x-5=-27
    2x-5=-27
    2x=-27+5
    2x=-22
    x=-22:2
    x=-11

  2. $\text{ @HV }$
    $\text{ a) x + 35 = 14 }$
    $\text{ x = 14 – 35 }$
    $\text{ x = -21 }$
    $\text{ b) x – 27 = -85 }$
    $\text{ x = -85 + 27 }$
    $\text{ x = -58 }$
    $\text{ c) x + 18 = $(-2)^{3}$ x 5 }$
    $\text{ x + 18 = 8 x 5 }$
    $\text{ x + 18 = 40 }$
    $\text{ x = 40 – 18 }$
    $\text{ x = 22 }$
    $\text{ d) 3x – 5 = -125 }$
    $\text{ 3x = -125 + 5 }$
    $\text{ 3x = -120 }$
    $\text{ x = -40 }$
    $\text{ e) (-6)x + 1 = $3^{3}$ }$
    $\text{ (-6)x + 1 = 27 }$
    $\text{ (-6)x = 26 }$
    $\text{ x = 26 : (-6) }$
    $\text{ x = $\dfrac{26}{-6}$ }$
    $\text{ f) 3x – (x + 5) = -27 }$
    $\text{ 3x – x – 5 = -27 }$
    $\text{ 2x – 5 = -27 }$
    $\text{ 2x = -22 }$
    $\text{ x = -11 }$

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222-9+11+12:2*14+14 = ? ( )

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