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    20lg(1/(2x*sqrt(1+2x^2)))=4.58
    20lg(1/(2x*sqrt(1+2x^2)))=8
    20lg(1/2x)=-6
    20lg(1/x)=-6
    1/(2x*sqrt(1-x^2))=8
    1/(2x*sqrt(1-x^2))=4.58
    x×√(1+x∧2)×√(1+0.04x∧2)=1
    x×√(1+x∧2)×√(1+0.2x∧2)
    x^2+(12-1/2*x)^2=40
    -x^2-2x+3
    x^2-9.4x+15.3=0
    0.4:1.2=x:2/3
    2x+x=27
    99.74=(1424-x)/1424
    2x+1/3=1-x-1/5
    1/(1+e^(-x)) = 10^(-7)
    1/(1+e^(-x)) = 10^(-6)
    1/(1+e^(-x))=10^(-18)
    1/(1+e^(-x))=10^(-5)
    1/(1+e^(-x))=10^(-7)

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