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

Toán Lớp 7: Tìm x, biết (5x – 1) ngũ 6 = 729

Toán Lớp 7: Tìm x, biết (5x – 1) ngũ 6 = 729

Comments ( 2 )

  1. @Sun ú
    Giải đáp:
    Lời giải và giải thích chi tiết:
    \text{}$5x-1^{6}$ =729
    \text{}$5x-1^{6}$ =$3^{6}$ 
    5x-1=3 hoặc 5x-1=-3
    => x=$\left \{ {{\frac{4}{5}} \atop {\frac{-2}{5}}} \right.$ 
    Vậy x=$\frac{4}{5}$ ;$\frac{-2}{5}$ 

  2. ~ Bạn tham khảo ~
    (5x-1)^6 = 729
    => (5x-1)^6 = (+-3)^6
    \(⇒\left[ \begin{array}{l}5x-1=3\\5x-1=-3\end{array} \right.\)
    \(⇒\left[ \begin{array}{l}5x=4\\5x=-2\end{array} \right.\)
    \(⇒\left[ \begin{array}{l}x=\dfrac45\\x=-\dfrac25\end{array} \right.\)
    Vậy x={4/5;-2/5}

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

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