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

Toán Lớp 7: Tìm x biết (2x + 1) nhân (x-1/7)= 0

Toán Lớp 7: Tìm x biết (2x + 1) nhân (x-1/7)= 0

Comments ( 2 )

  1. Answer
    (2x + 1) . (x – 1/7) = 0
    => $\left[\begin{matrix} 2x + 1 = 0\\ x – \dfrac{1}{7} = 0\end{matrix}\right.$
    => $\left[\begin{matrix} 2x = 0 – 1\\ x = 0 + \dfrac{1}{7}\end{matrix}\right.$
    => $\left[\begin{matrix} 2x = – 1\\ x = \dfrac{1}{7}\end{matrix}\right.$
    => $\left[\begin{matrix} x = – 1 : 2\\ x = \dfrac{1}{7}\end{matrix}\right.$
    => $\left[\begin{matrix} x = \dfrac{-1}{2}\\ x = \dfrac{1}{7}\end{matrix}\right.$
    $\text{Vậy}$ x \in {-1/2 ; 1/7}

  2. Giải đáp:
     
    Lời giải và giải thích chi tiết:
     (2x+1) . (x – 1/7) = 0
    <=> \(\left[ \begin{array}{l}2x+1=0\\x – \frac{1}{7}=0\end{array} \right.\)  
    <=> \(\left[ \begin{array}{l}x=\frac{-1}{2}\\x=\frac{1}{7}\end{array} \right.\) 
    #Chii
    #Tired of studying well

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

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