0.15-2*x/(2037.4*9.80665)*(1-ln(2*x/(2037.4*9.80665*0.15)))-0.07732
    0.15-2*x/(2037.4*9.80665)*(1-ln(2*x/(2037.4*9.80665*0.15)))-0.07602
    0.15-2*x/(2037.4*9.80665)*(1-ln(2*x/(2037.4*9.80665*0.15)))-0.06176
    2x-6/x=-3/x
    2x-6/x=3/x
    576x/2080+x=11
    1+(680+576x)/2080+x=11
    680+(680+576x)/2080+x=11
    3+(680*3+574x)/2080+x=21
    2+(680*2+574x)/2080+x=21
    1+(680+574x)/2080+x=21
    1+(680+574x)/2080=21
    0.0135*x^5 - 0.7349*x^4 + 9.7089*x^3 - 54.157*x^2 + 137.98*x - 60.445=51.039
    0.06*x^5-1.7604*x^4+18.129*x^3-86.722*x^2+197.62*x-95.405=55.598
    x-sinx=4.71
    a*a(1+0.04a*a)(1+0.0025a*a)=63.14
    100/[w×w×(1+w×w)×(1+0.2w×0.2w)]＝1
    10/[w×w×(1+w×w)×(1+0.2w×0.2w)]＝100
    10/[w×w×(1+w×w)×(1+0.2w×0.2w)]＝1
    10/[w×w×(1+w×w)×(1+0.2w×0.2w)]

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