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

Toán Lớp 6: Tìm x: (2x+1) ³=343 Giúp mình đi

Toán Lớp 6: Tìm x:
(2x+1) ³=343
Giúp mình đi

Comments ( 2 )

  1. $\#Lynn2007$
    (2x+1)^3=343
    <=>(2x+1)^3=7^3
    =>2x+1=7
    <=>2x=6
    <=>x=3
    \text{Vậy x = 3}
     

  2. $\text{(2x+1)³=343}$
    $\text{⇒(2x+1)³=7³}$
    $\text{Chiệt tiêu mũ 3 với mũ 3 là còn⇒2x+1=7}$
    $\text{⇒2x=7-1}$
    $\text{⇒2x=6}$
    $\text{⇒x=6:2}$
    $\text{⇒x=3}$
    $\text{Vậy x=3}$
     

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

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