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

Toán Lớp 8: x^2-93 x+182=0 ai giúp mik tìm x câu này với:((

Toán Lớp 8: x^2-93 x+182=0 ai giúp mik tìm x câu này với:((

Comments ( 2 )

  1. x^2-93x+182=0
    ⇔x^2-2x-91x+182=0
    ⇔x(x-2)-91(x-2)=0
    ⇔(x-2)(x-91)=0
    ⇔x-2=0⇔x=2
    x-91=0⇔x=91
    Vậy x={2,91}

  2. $x^{2}-93x+182=0$
    $x^{2}-2x-91+182=0$
    $x(x-2)-91(x-2)=0$
    $(x-2)(x-91)=0$
    =>$\left[\begin{matrix} x-2=0\\ x-91=0\end{matrix}\right.$
    =>$\left[\begin{matrix} x=0+2\\ x=0+91\end{matrix}\right.$
    =>$\left[\begin{matrix} x=2\\ x=91\end{matrix}\right.$
    Vậy x={2;91}
    $vuatoan208$

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