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

Toán Lớp 12: Tìm x biết ( x – 2 ) . ( x + 15 ) = 0

Toán Lớp 12: Tìm x biết
( x – 2 ) . ( x + 15 ) = 0

Comments ( 2 )

  1. $\text{( $x$ – 2 ) . ( $x$ + 15 ) = 0 }$
    ⇒ $\left[\begin{matrix} x-2=0\\ x+15=0\end{matrix}\right.$
    ⇒ $\left[\begin{matrix} x=2+0\\ x=0-15\end{matrix}\right.$
    ⇒ $\left[\begin{matrix} x=2\\ x=-15\end{matrix}\right.$
    Vậy $\text{ $x$ ∈ { 2 ; -15 } }$

  2. ( x – 2 ) . ( x + 15 ) = 0
    => $\begin{cases} x-2=0\\x+15=0\\\end{cases}$  
    => $\left[\begin{matrix} x+2=2\\ x-15=-15\end{matrix}\right.$
    => $\left[\begin{matrix} x=2\\ x=-15\end{matrix}\right.$
    Vậy : x ∈ { 2 , -15 }

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

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