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

Toán Lớp 8: Tìm x biết x(x – 1) + x – 1 = 0

Toán Lớp 8: Tìm x biết
x(x – 1) + x – 1 = 0

Comments ( 2 )

  1. Giải đáp + Lời giải và giải thích chi tiết:
    x(x – 1) + x – 1 = 0
    => (x – 1)(x + 1) = 0  
    => \(\left[ \begin{array}{l}x=1\\x=-1\end{array} \right.\) 
    Vậy x ∈ {-1;1}

  2. $x(x – 1) + x – 1 = 0$
    $⇒x(x – 1) + (x – 1) = 0$
    $⇒(x+1)(x – 1) = 0$
    $⇒$\(\left[ \begin{array}{l}x+1=0\\x – 1=0\end{array} \right.\) 
    $⇒$\(\left[ \begin{array}{l}x=-1\\x =1\end{array} \right.\) 
    $Vậy$ $x ∈$ {$-1 ; 1$}

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

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