100*（1+r）^2 = 100*（1+6%）*（1+7%）
    100*（1+r）^2=100*（1+6%）*（1+7%）
    6/[w×sqrt(1+0.2w×0.2w)×sqrt(1+0.05w×0.05w）]＝0.70
    lgx=－0.155
    lgx=-62
    lgx=62
    lg{6/[w×sqrt(1+0.2w×0.2w)×sqrt(1+0.05w×0.05w）]}＝-62
    lg{6/[w×sqrt(1+0.2w×0.2w)×sqrt(1+0.05w×0.05w）]}＝-18.6
    arctan(0.26*x)-arctan(0.2*x)-arctan(0.05*x)-arctan(0.14*x)=-90
    arctan0.26x-arctan0.2x-arctan0.05x-arctan0.14x=-90
    arctan0.26w-arctan0.2w-arctan0.05w-arctan0.14w=-3.14/2
    arctan0.26w-arctan0.2w-arctan0.05w-arctan0.14w=-π/2
    arctan(0.255w)-90-arctan(0.13w)-arctan(0.2w)-arctan(0.05w)=-180
    arctan(0.255w)-90-arctan(0.13w)-arctan(0.2w)-arctan(0.05w)=-180
    arctan(0.255w)-90-arctan(0.13w)-arctan(0.2w)-arctan(0.05w)=-180
    arctan(0.255w)-90-arctan(0.13w)-arctan(0.2w)-arctan(0.05w)=-180
    arctan(0.255w)-90-arctan(0.13w)-arctan(0.2w)-arctan(0.05w)=-180
    arctan(0.255w)-90-arctan(0.13w)-arctan(0.2w)-arctan(0.05w)=-180
    arctan(0.255w)-90-arctan(0.13w)-arctan(0.2w)-arctan(0.05w)=-180
    arctan(0.255w)-90-arctan(0.13w)-arctan(0.2w)-arctan(0.05w)=-180

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