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

Toán Lớp 6: Tìm số tự nhiên x thỏa mãn 3^x + 1+3^x= 36

Toán Lớp 6: Tìm số tự nhiên x thỏa mãn 3^x + 1+3^x= 36

Comments ( 2 )

  1. 3^{x+1}+3^x=36
    =>3^x .3+3^x .1=36
    =>3^x(3+1)=36
    =>3^x= .4=36
    =>3^x=36:4
    =>3^x=9
    =>3^x=3^2
    =>x=2
    Vậy x=2 
     

  2. Answer
    3^{x+1} + 3^{x} = 36
    $\Rightarrow$ 3^{x} . 3^{1} + 3^{x} . 1 = 36
    $\Rightarrow$ 3^{x} . (3^{1} + 1) = 36
    $\Rightarrow$ 3^{x} . 4 = 36
    $\Rightarrow$ 3^{x} = 36 : 4
    $\Rightarrow$ 3^{x} = 9
    $\Rightarrow$ 3^{x} = 3^{2}
    $\Rightarrow$ x = 2
    $\text{Vậy}$ x = 2

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

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