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

Toán Lớp 8: `(3x-2)^2 – (2x-1)^2 =0` tìm x nha

Toán Lớp 8: (3x-2)^2 – (2x-1)^2 =0
tìm x nha

Comments ( 2 )

  1. (3x – 2)^{2} – (2x + 1)^{2} = 0
    => (3x – 2 – 2x – 1)( 3x – 2 + 2x + 1) = 0
    => (x – 3)(5x – 1) = 0
    =>\(\left[ \begin{array}{l}x – 3 = 0\\5x – 1 = 0\end{array} \right.\) 
    =>\(\left[ \begin{array}{l}x=3\\5x=1\end{array} \right.\) 
    =>\(\left[ \begin{array}{l}x=3\\x=1/5\end{array} \right.\) 
    Vậy x ∈ { 3 ; 1/5 }
     

  2. (3x-2)^2-(2x+1)^2=0
    <=>(3x-2-2x-1)(3x-2+2x+1)=0
    <=>(x-3)(5x-1)=0
    <=>$\left[\begin{matrix} x-3=0\\ 5x-1=0\end{matrix}\right.$
    <=>$\left[\begin{matrix} x=3\\ x=\dfrac{1}{5}\end{matrix}\right.$
    Vậy S={3;1/5}
     

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

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