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

Toán Lớp 6: Tìm số nguyên x,biết: a)5.(x-2)=0 b)(5-x).(x+7)=0

Toán Lớp 6: Tìm số nguyên x,biết:
a)5.(x-2)=0
b)(5-x).(x+7)=0

Comments ( 2 )

  1. a) 5 . (x – 2) = 0
    x – 2 = 0 : 5
    x – 2 = 0
    x = 0 + 2
    x = 2
    Vậy x = 2
    __________________________
    b) (5 – x).(x + 7) = 0
    => $\left[\begin{matrix} 5 – x=0\\ x+7=0\end{matrix}\right.$
    => $\left[\begin{matrix} x=5 – 0\\ x=0 – 7\end{matrix}\right.$
    => $\left[\begin{matrix} x=5\\ x=-7\end{matrix}\right.$
    Vậy x = 5 ; x = -7

  2. $ a) 5 . ( x-2 ) = 0 $ 
    $ ⇒ x – 2 = 0 $
    $ x = 2 $ 
    $ b) ( 5-x ) ( x+7) = 0 $ 
    $ ⇒ $ \(\left[ \begin{array}{l}5-x=0\\x+7=0\end{array} \right.\) 
    $ ⇒ $ \(\left[ \begin{array}{l}x=5\\x=-7\end{array} \right.\) 

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

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