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

Toán Lớp 6: tìm x: ( x – 5 )^2006 = ( x – 5 )^2009

Toán Lớp 6: tìm x: ( x – 5 )^2006 = ( x – 5 )^2009

Comments ( 2 )

  1. ( x – 5)^2006 = ( x – 5)^2009
    (x – 5)^2006 – ( x – 5)^2009 = 0
    (x – 5)^2006 – ( x – 5)^2006 . ( x – 5)^3 = 0
    ( x – 5)^2006 . [1 – ( x – 5)^3] = 0
    => +)TH1 :
    (x – 5)^2006 = 0
    x – 5 = 0
    x = 0 + 5
    x = 5
    => +)TH2 :
    1 – ( x – 5)^3 = 0
    (x – 5)^3 = 1 – 0
    (x – 5)^3 = 1
    (x – 5)^3 = 1^3
    => x – 5 = 1
    x = 1 + 5
    x = 6
    Vậy x \in { 5 ; 6}
    #caty09

  2. Giải đáp:
     Vậy x=5 hoặc x=6
    Lời giải và giải thích chi tiết:
    (x-5)^{2006}=(x-5)^{2009}
    (x-5)^{2006}-(x-5)^{2009}=0
    (x-5)^{2006}.[1-(x-5)^{2003}]=0
    ⇒\(\left[ \begin{array}{l}(x-5)^{2006}=0\\1-(x-5)^{2003}=0\end{array} \right.\)
    ⇒\(\left[ \begin{array}{l}x-5=0\\(x-5)^{2003}=1\end{array} \right.\)
    ⇒\(\left[ \begin{array}{l}x=5\\x-5=1\end{array} \right.\)
    ⇒\(\left[ \begin{array}{l}x=5\\x=6\end{array} \right.\)

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