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

Toán Lớp 6: (4mũ x-1)mũ2=259 Giải giúp mình nhé

Toán Lớp 6: (4mũ x-1)mũ2=259
Giải giúp mình nhé

Comments ( 2 )

  1. ($4^x$-1)²=25·9
    ⇒($4^x$-1)²=225=15²
    ⇒$4^x$-1=15
    ⇒$4^x$ = 15 + 1
    Đến đây tự làm
     

  2. $\text{($4^x$ – 1)² = 25·9}$
    $\text{⇒($4^x$ – 1)² = 225}$
    $\text{⇒($4^x$ – 1)² = 15²}$
    $\text{⇒$4^x$ – 1 = 15}$
    $\text{⇒$4^x$ = 15+1 }$
    $\text{⇒$4^x$ = 16}$
    $\text{⇒$4^x$ = 4²}$
    $\text{⇒ x = 2}$
    $\text{Vậy x = 2}$
     

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