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

Toán Lớp 6: a, ( 3 . x – 1 ) ^3 = 512 b, x^7 = x ^2

Toán Lớp 6: a, ( 3 . x – 1 ) ^3 = 512
b, x^7 = x ^2

Comments ( 2 )

  1. Giải đáp +Lời giải và giải thích chi tiết:
      a, ( 3x – 1)^3 = 512
    -> ( 3x – 1)^3 = 8^3
    -> 3x-  1=8
    -> 3x = 9
    -> x = 3
    b, x^7 = x^2
    -> x^7 – x^2 = 0
    -> x^2 (x^5 – 1) = 0
    -> \(\left[ \begin{array}{l}x^2 =0\\x^5 – 1 =0\end{array} \right.\) 
    -> \(\left[ \begin{array}{l}x=0\\x=1\end{array} \right.\) 

  2. a) (3x – 1 ) ^3 = 512
    (3x – 1 ) ^3=8^3
    3x-1=8
    3x=8+1
    3x=9
    x=9/3
    x=3
    b)x^7 = x ^2
    x^7-x^2=0
    x^2(x^5-1)=0
    x^2=0 hay x^5-1=0
    x=0 hay x^5=1
    x=0 hay x=1
     

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