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

Toán Lớp 7: (x – 3).(x+2) = 0 Giúp mình với ạ!

Toán Lớp 7: (x – 3).(x+2) = 0
Giúp mình với ạ!

Comments ( 2 )

  1. (x – 3).(x+2) = 0
    =>$\begin{cases} x-3=0\\x+2= 0\\ \end{cases}$ =>$\begin{cases} x=3\\x=-2\\ \end{cases}$
    Vậy x = {3 ; -2}

  2. (x-3)(x+2) = 0
    $\Leftrightarrow$  $\left[\begin{matrix} x-3=0\\ x+2=0\end{matrix}\right.$
    $\Leftrightarrow$  $\left[\begin{matrix} x=0 + 3\\ x=0 – 2\end{matrix}\right.$
    $\Leftrightarrow$  $\left[\begin{matrix} x=3\\ x=-2\end{matrix}\right.$
    $\text{Vậy}$ x $\in$ {3;-2}

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