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

Toán Lớp 10: 2x(x-3)+6(x-3)=0 giúp mình với cần gấp ạ

Toán Lớp 10: 2x(x-3)+6(x-3)=0
giúp mình với cần gấp ạ

Comments ( 2 )

  1. $\text{2x.(x – 3) + 6.(x – 3) = 0}$
    $\text{(x – 3).(2x + 6) = 0}$
    $\text{2.(x – 3)(x + 3) = 0}$
    $\text{mà 2 khác 0}$
    $\text{⇒ x – 3 = 0 hoặc x + 3 = 0}$
    $\text{⇒ x = 3 hoặc x = -3}$

  2. 2x ( x – 3 ) + 6 ( x – 3 ) = 0
    => ( x – 3 ) ( 2x + 6 ) = 0
    => \(\left[ \begin{array}{l}x-3=0\\2x+6=0\end{array} \right.\) 
    => \(\left[ \begin{array}{l}x=3\\2x=-6\end{array} \right.\) 
    => \(\left[ \begin{array}{l}x=3\\x=-3\end{array} \right.\) 
    Vậy x $\in$ { 3 ; -3 }  

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

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