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

Toán Lớp 5: Tìm $x$ : (2 x $x$ – 8) x ( 4 x $x$ – 20) = 0

Toán Lớp 5: Tìm $x$ : (2 x $x$ – 8) x ( 4 x $x$ – 20) = 0

Comments ( 2 )

  1. \(\left[ \begin{array}{l}2 × x -8 = 0\\4 × x – 20 = 0\end{array} \right.\)
    \(\left[ \begin{array}{l}x = 0 + 8 ÷ 2\\x = 0 + 20 ÷ 4\end{array} \right.\) \(\left[ \begin{array}\(\left[ \begin{array}{l}x=4\\x=5\end{array} \right.\) 
    [ là hoặc

  2. $#QLinkVN$
    Giải phép tính trên như sau:
    (2xxx-8)xx(4xxx-20)=0
    ⇔(2xxx-2xx4)xx(4xxx-4xx5)=0
    ⇔2xx(x-4)xx4xx(x-5)=0
    ⇔8xx(x-4)(x-5)=0
    ⇔ 8=0 (vô lí) hoặc x-4=0 hoặc x-5=0
    ⇔ x=4 hoặc x=5
    Vậy x=4 hoặc x=5

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

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