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

Toán Lớp 8: giá trị của x thỏa mãn 2x(3+3)+2(x+3)=0

Toán Lớp 8: giá trị của x thỏa mãn 2x(3+3)+2(x+3)=0

Comments ( 2 )

  1. 2x.(x+3)+2.(x+3)=0
    <=>(x+3).(2x+2)=0
    \(⇔\left[ \begin{array}{l}x+3=0\\2x+2=0\end{array} \right.\)
    \(⇔\left[ \begin{array}{l}x=-3\\2x=-2\end{array} \right.\)
    \(⇔\left[ \begin{array}{l}x=-3\\x=-1\end{array} \right.\) 
    Vậy x ∈{-3 ;-1}
    $#chúc tus học tốt!!$
    #La
     

  2. 2x ( x +3) + 2( x +3) = 0 
    ( x +3)( 2x +2) = 0
    ⇒ \(\left[ \begin{array}{l}x+3 =0 \\2x +2 = 0\end{array} \right.\) 
    \(\left[ \begin{array}{l}x =-3\\2x  = -2\end{array} \right.\) 
    \(\left[ \begin{array}{l}x= -3  \\ x = -1 \end{array} \right.\) 
    Vậy x = -3 hay x = -1 

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

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