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

Toán Lớp 6: tìm x ( x + 9 ) . ( x + 2 ) = 10

Toán Lớp 6: tìm x
( x + 9 ) . ( x + 2 ) = 10

Comments ( 2 )

  1. ( x + 9 ) . ( x + 2 ) = 10
    ⇔ $\left[\begin{matrix} x+9=10\\ x+2=10\end{matrix}\right.$
    ⇔ $\left[\begin{matrix} x=10-9\\ x=10-2\end{matrix}\right.$
    ⇔ $\left[\begin{matrix} x=1\\ x=8\end{matrix}\right.$
    Vậy x ∈ { 1 ; 8 }

  2. Giải đáp:
    ( x + 9 ) . ( x + 2 ) = 10
    $ <=> \left[\begin{matrix} x+9=10\\ x+2=10\end{matrix}\right. $
    $ <=> \left[\begin{matrix} x=10-9\\ x=10-2\end{matrix}\right. $
    $ <=> \left[\begin{matrix} x=1\\ x=8\end{matrix}\right. $
    Vậy x = 1 hoặc x = 8
    #AkiSha2007

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

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