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

Toán Lớp 12: giải pt $2^{2x-1}$ +$4^{x+1}$ =5

Toán Lớp 12: giải pt
$2^{2x-1}$ +$4^{x+1}$ =5

Comments ( 1 )

  1. 2^(2x-1)+4^(x+1)=5
    <=>2^(2x-1)+2^(2x+2)=5
    <=>2^(2x)*1/2+2^(2x)*4=5
    <=>9/2*2^(2x)=5
    <=>2^(2x)=10/9
    <=>2x=1+log_2\frac(5)(9)
    <=>x=1/2+1/2log_2\frac(5)(9)
    Vậy S={1/2+1/2log_2\frac(5)(9)}

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