(X-1000)÷[（X+1000）/2]=0.05
    ln（X^3-3X)=-X/2
    ln(X^3-3X)=-X/2
    ln（X^3-3X)=-X/2
    ln（X^3-3X)=-X/2
    ln（X^3-3X)=-X/2
    6.6*6.6*10^(-28)*x^4+2*6.6*10^(-14)*x^3+(27*6.6*6.6*10^(-12)-2)*x^2+54*6.6*100*x+27*10^16=0
    6.6*6.6*10^(-28)*x^4+2*6.6*10^(-14)*x^3+(27*6.6*6.6*10^(-20)-2)*x^2+54*6.6*10^(-14)*x+27*10^16=0
    6.6*6.6*10^(-28)*x^4+2*6.6*10^(-14)*x^3+(9*6.6*6.6*10^(-12)-3)*x^2+18*6.6*100*x+90000000000000000=0
    6.6*6.6*10^(-28)*x^4+2*6.6*10^(-14)*x^3+(9*6.6*6.6*10^(-20)-2)*x^2+18*6.6*10^(-14)*x+900000000=0
    X^3+6X^2-3X-6=0
    6.6*6.6*10^(-28)*x^4+2*6.6*10^(-14)*x^3+(9*6.6*6.6*10^(-20)-2)*x^2+18*6.6*10^(-14)*x+900000000=0
    2s^3+23s^2+80s+35=0
    [1/(0.5x+1)]*[1/(0.5x+1)]
    [1/(0.5x+1)]*[1/(0.5x+1)]
    ( 1/0.5x+1)*(1/0.5x+1)
    x^3=1-x
    ( 1/0.5x+1)*(1/0.5x+1)
    x = 16500/167
    x = 16500/167

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