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

Toán Lớp 8: (4x-1)^2-4=0 ai giải giup vs ạ

Toán Lớp 8: (4x-1)^2-4=0 ai giải giup vs ạ

Comments ( 2 )

  1. Giải đáp:
    (4x-1)^2-4=0
    <=> (4x – 1)^2 – 2^2 = 0
    <=> (4x – 1 – 2)( 4x-1 + 2)=0
    <=> (4x – 3)(4x + 1)= 0
    <=> $\left[\begin{matrix} 4x-3=0\\ 4x+1=0\end{matrix}\right.$
    <=> $\left[\begin{matrix} x=\dfrac{3}{4}\\ x=\dfrac{-1}{4}\end{matrix}\right.$
    Vậy S= { 3/4 ; -1/4}

  2. (4x-1)^2-4=0
    ⇔(4x-1-2)(4x-1+2)=0
    ⇔(4x-3)(4x+1)=0
    ⇔\(\left[ \begin{array}{l}4x-3=0\\4x+1=0\end{array} \right.\) 
    ⇔\(\left[ \begin{array}{l}x=\dfrac{3}{4}\\x=-\dfrac{1}{4}\end{array} \right.\) 
    Vậy S={3/4,-1/4}

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

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