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

Toán Lớp 6: Tìm x , biết ( 2x – 1 )^3 = 27

Toán Lớp 6: Tìm x , biết
( 2x – 1 )^3 = 27

Comments ( 2 )

  1. $\text{(2x – 1)³ = 27}$
    $\text{(2x – 1)³ = (3)³}$
    $\text{⇒ 2x – 1 = 3}$
    $\text{2x = 3 + 1}$
    $\text{2x = 4}$
    $\text{x = 4 : 2}$
    $\text{x = 2}$
    $\text{Vậy x = 2}$
    $\textit{Ha1zzz}$
     

  2. Lời giải chi tiết:
    (2x-1)^3=27
    =>(2x-1)^3=3^3
    =>2x-1=3
    =>2x=3+1
    =>2x=4
    =>x=4:2
    =>x=2
    Vậy x=2

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

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