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

Toán Lớp 7: tính giá trị truyệt đối -5 [ 24 -x ] =-11

Toán Lớp 7: tính giá trị truyệt đối
-5 [ 24 -x ] =-11

Comments ( 2 )

  1. -5|24-x|=-11
    $\Leftrightarrow$ |24-x|=$\dfrac{11}{5}$
    $\Leftrightarrow$ $\left[\begin{matrix} 24-x=$\dfrac{11}{5}$\\ 24-x=$\dfrac{11}{5}$\end{matrix}\right.$
    $\Leftrightarrow$ $\left[\begin{matrix} x=24-$\dfrac{11}{5}$\\ x=24-$\dfrac{-11}{5}$\end{matrix}\right.$
    $\Leftrightarrow$ $\left[\begin{matrix} x=$\dfrac{109}{5}$\\ x=$\dfrac{131}{5}$\end{matrix}\right.$

  2. -5.|24 – x| = -11 
    ⇔ |24 – x| = $\frac{11}{5}$ 
    ⇔ \(\left[ \begin{array}{l}24 – x = \frac{11}{5}\\24 – x = -\frac{11}{5}\end{array} \right.\) 
    ⇔ \(\left[ \begin{array}{l}x = \frac{109}{5}\\x = \frac{131}{5}\end{array} \right.\) 
    Vậy x ∈ {$\frac{109}{5}$; $\frac{131}{5}$}
     

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

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