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

Toán Lớp 7: Tìm x: $2^{x-2}$ – 3.2^{x}$ = -88

Toán Lớp 7: Tìm x:
$2^{x-2}$ – 3.2^{x}$ = -88

Comments ( 2 )

  1. $\text{ $2^{x-2}$ – 3. $2^x$ = -88 }$
    $\Rightarrow$ $\text{ $2^x$. $\dfrac{1}{2^2}$ – 3. $2^x$ = -88 }$
    $\Rightarrow$ $\text{ $2^x$. ( $\dfrac{1}{4}$ – 3 ) = -88 }$
    $\Rightarrow$ $\text{ $2^x$. $\dfrac{-11}{4}$ = -88 }$
    $\Rightarrow$ $\text{ $2^x$ = -88 : $\dfrac{-11}{4}$ }$
    $\Rightarrow$ $\text{ $2^x$ = 32 }$
    $\Rightarrow$ $\text{ $2^x$ = $2^5$ }$
    $\Rightarrow$ $\text{ x = 5 }$
      $\text{ Vậy x = 5 }$
     

  2. Giải đáp:
     
    Lời giải và giải thích chi tiết:
     

    toan-lop-7-tim-2-2-3-2-88

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