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

Toán Lớp 6: $2^{x+2}$ + $2^{x+4}$ – $2^{x+1}$ +$2^{5}$ =320

Toán Lớp 6: $2^{x+2}$ + $2^{x+4}$ – $2^{x+1}$ +$2^{5}$ =320

Comments ( 2 )

  1. 2^{x+2} + 2^{x+4} – 2^{x+1} + 2^{5} = 320
    $\Rightarrow$ 2^{x} . 4 + 2^{x} . 2^{4} – 2^{x} . 2 + 32 = 320
    $\Rightarrow$ 2^{x} . (4 + 16 – 2) + 32 = 320
    $\Rightarrow$ 2^{x} . (20 – 2) = 320 – 32
    $\Rightarrow$ 2^{x} . 18 = 288
    $\Rightarrow$ 2^{x} = 288 : 18
    $\Rightarrow$ 2^{x} = 16
    $\Rightarrow$ 2^{x} = 2^{4}
    $\Rightarrow$ x = 4
    $\text{Vậy}$ x = 4

  2. Giải đáp:
    x=4 
    Lời giải và giải thích chi tiết:
    2^(x+2)+2^(x+4)-2^(x+1)+2^5=320
    =>2^x . 2^2+2^x . 2^4-2^x . 2+32=320
    =>2^x . 4+2^x . 16-2^x . 2=320-32
    =>2^x . (4+16-2)=288
    =>2^x . 18=288
    =>2^x=288:18
    =>2^x=16
    =>2^x=2^4
    =>x=4
    Vậy x=4

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

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