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

Toán Lớp 8: 5x(x-2000)-x+2000=0 giúp tui

Toán Lớp 8: 5x(x-2000)-x+2000=0 giúp tui

Comments ( 2 )

  1. $5x(x-2000)-x+2000=0$
    $⇒5x(x-2000)-(x-2000)=0$
    $⇒(5x-1)(x-2000)=0$
    $⇒$\(\left[ \begin{array}{l}5x-1=0\\x-2000=0\end{array} \right.\) 
    $⇒$\(\left[ \begin{array}{l}5x=1\\x=2000\end{array} \right.\) 
    $⇒$\(\left[ \begin{array}{l}x=\frac{1}{5}\\x=2000\end{array} \right.\) 
    $vậy$ $x =$ {$\frac{1}{5} ; 2000$}

  2. 5x(x-2000)-x+2000=0
    <=>5x(x-2000)-(x-2000)=0
    <=>(x-2000)(5x-1)=0
    <=>x=2000 hoặc x=1/5
    Vậy S={2000;1/5}

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