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

Toán Lớp 8: Tìm x, biết: 5x(x-2021)-3(x-2021)=0

Toán Lớp 8: Tìm x, biết:
5x(x-2021)-3(x-2021)=0

Comments ( 2 )

  1. $ 5x ( x – 2021 ) – 3 ( x – 2021 ) = 0 $
    ⇒ $ ( x – 2021 ) ( 5x – 3 ) = 0 $
    ⇒ \(\left[ \begin{array}{l}x-2021=0\\5x-3=0\end{array} \right.\) 
    ⇒ \(\left[ \begin{array}{l}x=2021\\x=\dfrac{3}{5}\end{array} \right.\) 
    Vậy $ x = 2021 $ hoặc $ x = \dfrac{3}{5}$

  2. 5x(x-2021)-3(x-2021)=0
    ⇔(x-2021)(5x-3)=0
    ⇔\(\left[ \begin{array}{l}x-2021=0\\5x-3=0\end{array} \right.\) 
    ⇔\(\left[ \begin{array}{l}x=2021\\x=\dfrac{3}{5}\end{array} \right.\) 
    Vậy x=2021 hoặc x=3/5
     

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