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

Toán Lớp 8: x(x-2019)-x+2019=0; (3x-4)^2- (x+2)^2=0

Toán Lớp 8: x(x-2019)-x+2019=0; (3x-4)^2-
(x+2)^2=0

Comments ( 1 )

  1. $\textit{Giải đáp + Lời giải và giải thích chi tiết:}$
    $x(x-2019)-x+2019=0$
    $⇔x(x-2019)-(x-2019)=0$
    $⇔(x-1)(x-2019)=0$
    \(\left[ \begin{array}{l}x-1=0\\x-2019=0\end{array} \right.\)
    \(\left[ \begin{array}{l}x=1\\x=2019\end{array} \right.\)
    $\text{Vậy $x=1$ hoặc $x=2019$}$
    ____________________
    $(3x-4)^2-(x+2)^2=0$
    $⇔(3x-4-x-2)(3x-4+x+2)=0$
    $⇔(2x-6)(4x-2)=0$
    \(\left[ \begin{array}{l}2x-6=0\\4x-2=0\end{array} \right.\)
    \(\left[ \begin{array}{l}2x=6\\4x=2\end{array} \right.\)
    \(\left[ \begin{array}{l}x=3\\x=\dfrac{1}{2}\end{array} \right.\)
    $\text{Vậy $x=3$ hoặc}$ x=1/2

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