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

Toán Lớp 8: Tìm x:::::::::::::: x(x-4)+1=3x-5

Toán Lớp 8: Tìm x::::::::::::::
x(x-4)+1=3x-5

Comments ( 2 )

  1. Giải đáp+Lời giải và giải thích chi tiết:
    x(x-4)+1=3x-5
    ⇔ x^2 – 4x + 1 = 3x – 5
    ⇔ x^2 – 4x + 1 – 3x + 5 = 0
    ⇔ x^2 – 7x + 6 = 0
    ⇔ x(x – 6) – (x – 6) = 0
    ⇔ (x-6)(x-1) = 0
    ⇔ \(\left[ \begin{array}{l}x-6=0\\x-1=0\end{array} \right.\) 
    ⇔ \(\left[ \begin{array}{l}x=6\\x=1\end{array} \right.\) 

  2.  x(x – 4) + 1 = 3x – 5
    ⇔ x^2 – 4x + 1 = 3x – 5
    ⇔ x^2 – 4x + 1 – 3x + 5 = 0
    ⇔ x^2 – 7x + 6 = 0
    ⇔ x(x – 6) – (x-6) = 0
    ⇔ (x – 1)(x – 6) = 0
    ⇔ \(\left[ \begin{array}{l}x-1=0\\x-6=0\end{array} \right.\) 
    ⇔ \(\left[ \begin{array}{l}x=1\\x=6\end{array} \right.\) 
    Vậy x ∈ {1;6}

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

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