3X^2+25x-6300=0
    0.8x+20=x
    20+x*0.4=0.8x
    10x除2＝6乘8除2
    -7.81691493t^3+8.315228022t^2-5.37795594t+0.876087388=0
    -7.81691493x^3+8.315228022x^2-5.37795594x+0.876087388=0
    20=x+0.007x^(0.8850)
    -7.81691493X^3+8.315228022X^2-5.37795594X+0.876087388=0
    (1+r/2)^2-1=8.24%
    257/(85860*0.0005)=(-1.405578x^3+0.775268x^2+0.15838x-0.06831)(ln(85860/387.7))^3+(17.93006x^3-9.22091^2-2.37733x+0.86295)(ln(85860/387.7))^2+(-79.99715x^3+40.5562x^2+9.00157x-2.54543)(ln(85860/387.7))+(122.656069x^3-63.88418x^2-9.58936x+6.20045)
    257/(85860*0.0005)=(-1.405578x^3+0.775268x^2+0.15838x-0.06831)(ln(85860/387.7))^3+(17.93006x^3-9.22091^2-2.37733x+0.86295)(ln(85860/387.7))^2+(-79.99715x^3+40.5562x^2+9.00157x-2.54543)(ln(85860/387.7))+(122.656069x^3-63.88418x^2-9.58936x+6.20045)
    257/(85860*0.0005)=(-1.40557x^3+0.77526x^2+0.1583x-0.06831)*(ln(85860/387.7))^3+(17.93006x^3-9.22091^2-2.37733x+0.86295)*(ln(85860/387.7))^2+(-79.99715x^3+40.5562x^2+9.00157x-2.54543)*(ln(85860/387.7))+(122.656069x^3-63.88418x^2-9.58936x+6.20045)
    257/(85860*0.0005)=(-1.40557x^3+0.77526x^2+0.1583x-0.06831)*(ln(85860/387.7))^3+(17.93006x^3-9.22091^2-2.37733x+0.86295)*(ln(85860/387.7))^2+(-79.99715x^3+40.5562x^2+9.00157x-2.54543)*(ln(85860/387.7))+(122.656069x^3-63.88418x^2-9.58936x+6.20045)
    (1+x)(1-x)=0
    257/(85860*0.0005)=(-1.40557x^3+0.77526x^2+0.1583x-0.06831)*(ln(85860/387.7))^3+(17.93006x^3-9.22091^2-2.37733x+0.86295)*(ln(85860/387.7))^2+(-79.99715x^3+40.5562x^2+9.00157x-2.54543)*(ln(85860/387.7))+(122.656069x^3-63.88418x^2-9.58936x+6.20045)
    x*0.57*2.26*1.01=1.38
    x*0.57*1.26*1.01=1.38
    X+X*0.0445=1
    X+X*0.445=1
    259.94/(85855.47094*0.000496717)=(-1.40557x^3+0.77526x^2+0.1583x-0.06831)*((ln(85855.47094/261.820535))^3+(17.93006x^3-9.22091^2-2.37733x+0.86295)*((ln(85855.47094/261.820535))^2+(122.656069x^3-63.88418x^2-9.58936x+6.20045)

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