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

Toán Lớp 8: Tìm `x` để `(5-3x)/(x+3) = -2` `(5-3x)/(x+3)=-1/4`

Toán Lớp 8: Tìm x để
(5-3x)/(x+3) = -2
(5-3x)/(x+3)=-1/4

Comments ( 2 )

  1. $\\$
    (5-3x)/(x+3)=-2(x\ne -3)
    <=> 5-3x=-2x-6
    <=> 5-3x+2x+6=0
    <=> 11 – x=0
    <=>x=11 (T/m)
    Vậy x=11
    (5-3x)/(x+3)=(-1)/4(x\ne -3)
    <=> 5-3x=(-1)/4 x – 3/4
    <=> 5 – 3x + 1/4 x + 3/4=0
    <=> 23/4 – 11/4 x=0
    <=> 11/4 x =23/4
    <=>x=23/11 (T/m)
    Vậy x=23/11
     

  2. (5-3x)/(x+3) = -2
    ĐKXĐ: x\ne-3, x\ne 5/3
    <=> (5-3x)/(x+3) = (-2)/1
    <=> 5 – 3x = -2(x+3)
    <=> 5 – 3x = -2x – 6
    <=> 5 – 3x + 2x + 6 = 0
    <=> -x + 11 = 0
    <=> -x = -11
    <=> x = 11(t/m)
    Vậy x = 11
    __________________________
    (5-3x)/(x+3) = -1/4 (x \ne-3, x\ne-5/3)
    <=> 4(5-3x) = (-1)(x+3)
    <=> 20 – 12x = -x – 3
    <=> 20 -12x + x + 3 = 0
    <=> 23 – 11x = 0
    <=> 11x = 23
    <=> x = 23/11
    Vậy x = 23/11

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

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