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    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
    (630+630+X)/2*2300=1630
    (34100*20+232559.5)*((1+x)^-20) = (50000*((1+x)^5-1)/x)*(1+x)^22
    (86800*20+591969)*((1+x)^-20) = (50000*((1+x)^15-1)/x)*(1+x)^12
    (630+X)/2*2300=1630

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