(243.61-x)×0.311-2×4.7×(√0.311)+x
    (x)×0.311-2×4.7×√0.311=98.2
    2.879=1.74*(1+135/1.74*0.126)^x
    24.99/x=0.02842*(ln(118.26/x))^3-0.648*(ln(118.26/x))^2+4.9036*ln(118.26/x)-3.806
    19.93/x=0.02842*(ln(131.34/x))^3-0.648*(ln(131.34/x))^2+4.9036*ln(131.34/x)-3.806
    x*x*x=0.279
    19.93/x=0.02842*(ln(131.34/x))^3-0.648*(ln(131.34/x))^2+4.9036*(ln(131.34/x))-3.806
    21.35/x=0.02842*(ln(144.94/x))^3-0.648*(ln(144.94/x))^2+4.9036*(ln(144.94/x))-3.806
    20.64/x=0.02842*(ln(144.94/x))^3-0.648*(ln(144.94/x))^2+4.9036*(ln(144.94/x))-3.806
    x*x*x=75
    x*x*x=63/3
    x＾2-2x
    x-(x*32.2%)=0.25
    √(x*x-9)+√(x*x-1)=8
    3^x - 2^x = 65
    0.101*(1-exp(-1.1*x))*44.6*1000*3.14*0.25*x^2 = 10.8
    0.101*(1-exp(-1.1*x))*44.6*1000*3.14*0.25*x^2 = 8.94
    0.101*(1-exp(-1.1*x))*44.6*1000*3.14*0.25*x^2 = 17.89
    0.101*(1-exp(-1.1*x))*44.6*1000*3.14/4*x^2 = 17.89
    x-2/x+5

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