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

Toán Lớp 8: tìm x biết 2x(x-1)-2x^2=4 ta được: a)x=2 b)X=4 c)x=-2 d)x=-4

Toán Lớp 8: tìm x biết 2x(x-1)-2x^2=4 ta được:
a)x=2 b)X=4 c)x=-2 d)x=-4

Comments ( 2 )

  1. 2x(x – 1) – 2x^2 = 4
    <=> 2x^2 – 2x – 2x^2 = 4
    <=> -2x = 4
    <=> x = -2
    Vậy S = {-2}
     

  2. 2x(x-1)-2x^2=4
    <=>2x^2-2x-2x^2-4=0
    <=>-2x-4=0
    <=>-2x=4
    <=>x=-2
    Vậy x=-2
    ->C
     

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

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