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

Toán Lớp 8: Tìm x biết X(x-2) -3( x-2) =0

Toán Lớp 8: Tìm x biết
X(x-2) -3( x-2) =0

Comments ( 2 )

  1. x ( x – 2 ) – 3 ( x – 2 )=0
    ⇒ ( x – 3 ) ( x – 2 ) =0
    ⇒ \(\left[ \begin{array}{l}x – 3=0\\x – 2=0\end{array} \right.\) 
    ⇒ \(\left[ \begin{array}{l}x=3\\x=2\end{array} \right.\) 
    Vậy x ∈ { 3 ; 2 }

  2. x.(x-2)-3.(x-2)=0
    <=>(x-3).(x-2)=0
    <=>$\left[\begin{matrix} x-3=0\\ x-2=0\end{matrix}\right.$
    <=>$\left[\begin{matrix} x=3\\ x=2\end{matrix}\right.$
    Vậy x∈{3;2}
     

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