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

Toán Lớp 7: Tìm x, biết: `|2 . x – 3| = 3 . x + 2`

Toán Lớp 7: Tìm x, biết:
|2 . x – 3| = 3 . x + 2

Comments ( 2 )

  1. Giải đáp:
    $x \in$$\begin{cases} -5;\dfrac{1}{5} \end{cases}$$\left.\begin{matrix}\\\\ \end{matrix}\right\}$
    Lời giải và giải thích chi tiết:
    $|2.x-3| =3.x+2$ 
    =>$\left[\begin{matrix} 2x-3=3x+2\\ 2x-3=-(3x-2)\end{matrix}\right.$
    =>$\left[\begin{matrix} -x=5\\ 2x-3=-3x-2\end{matrix}\right.$
    =>$\left[\begin{matrix} x=-5\\ 5x=1\end{matrix}\right.$
    =>$\left[\begin{matrix} x=-5\\ x=\dfrac{1}{5}\end{matrix}\right.$
    =>$x \in$$\begin{cases} -5;\dfrac{1}{5} \end{cases}$$\left.\begin{matrix}\\\\ \end{matrix}\right\}$

  2. |2x – 3| = 3x + 2
    => $\left[\begin{matrix} 2x – 3 = 3x + 2\\ 2x – 3 =-(3x + 2)\end{matrix}\right.$
    => $\left[\begin{matrix} -x = 5\\ 2x – 3 =-3x – 2\end{matrix}\right.$
    => $\left[\begin{matrix} x = -5\\ 5x = 1\end{matrix}\right.$
    => $\left[\begin{matrix} x = -5\\ x= 1/5\end{matrix}\right.$
    Vậy x∈ {-5; 1/5}

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

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