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

Toán Lớp 8: Tìm x (2x-1).(8x-(4x-1).(4x+1)=0

Toán Lớp 8: Tìm x
(2x-1).(8x-(4x-1).(4x+1)=0

Comments ( 2 )

  1. (2x-1).8x-(4x-1)(4x+1)=0
    <=>16x^2-8x-[(4x)^2-1^2]=0
    <=>16x^2-8x-16x^2+1=0
    <=>-8x+1=0
    <=>-8x=-1
    <=>x=1/8
    vậy S={1/8}
     

  2. (2x-1).8x-(4x-1)(4x+1)=0
    ⇔16x^2-8x-16x^2+1=0
    ⇔-8x+1=0
    ⇔-8x=-1
    ⇔x=1/8
    Vậy S={1/8}
     

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

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