84.1= 35.411ln(x) - 7.034
    50 = 35.411ln(x) - 7.034
    2.04762*x^(5/3)+132.8125*x=2880000
    X*0.5+81.9=173.40
    40÷s^2÷(0.04*s^2+1)÷(0.0625*s^2+1)=1
    s^2*（0.04×s^2+1）*（0.0625^2*s^2+1）=1/1600
    s*（0.2s+1）*（0.0625s+1）=1/40
    0.2264339*x^(5/3)+6.1125*x=9216000
    0.2264339*x^(5/3)=921600
    84.1 = 38.134ln(x) - 6.8087
    50 = 38.134ln(x) - 6.8087
    -1*2*arctan1-arctan（0.2*w）-arctan（0.0625*w）=-1*4*arctan1
    -1*2*arctan1+arctan（0.2*w）+arctan（0.0625*w）=-1*4*arctan1
    (630+X)/2*2300/1000=1630
    X/2*2300=1630
    x+x*0.13=3941
    （2867400）*((1+x)^-20) = 750000*（1+x）^27
    tan(x)-x
    （630+X）/2*2300=1630
    {(630+X)/2}*2300=1630

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