4x-（2+x）*2=10
    x^2*ln(0.8*1.866/x/1.695)/(1-x)^2/ln(0.2*1.866/(1-x)/6.193)=1
    x^2*ln(0.8*1.868/x/1.695)/(1-x)^2/ln(0.2*1.868/(1-x)/6.193)=1
    x^2*ln(0.8*1.869/x/1.695)/(1-x)^2/ln(0.2*1.869/(1-x)/6.193)=1
    x^2*ln(0.8*1.864/x/1.695)/(1-x)^2/ln(0.2*1.864/(1-x)/6.193)=1
    x^2*ln(0.8*1.86/x/1.695)/(1-x)^2/ln(0.2*1.86/(1-x)/6.193)=1
    x^2*ln(0.8*1.87/x/1.695)/(1-x)^2/ln(0.2*1.87/(1-x)/6.193)=1
    x^2*ln(0.8*1.88/x/1.695)/(1-x)^2/ln(0.2*1.88/(1-x)/6.193)=1
    x^2*ln(0.8*1.89/x/1.695)/(1-x)^2/ln(0.2*1.89/(1-x)/6.193)=1
    x^2*ln(0.8*1.85/x/1.695)/(1-x)^2/ln(0.2*1.85/(1-x)/6.193)=1
    x^2*ln(0.8*1.98/x/1.695)/(1-x)^2/ln(0.2*1.98/(1-x)/6.193)=1
    x^2*ln(0.8*1.90/x/1.695)/(1-x)^2/ln(0.2*1.90/(1-x)/6.193)=1
    x^2*ln(0.8*1.93/x/1.695)/(1-x)^2/ln(0.2*1.93/(1-x)/6.193)=1
    x^2*ln(0.8*1.94/x/1.695)/(1-x)^2/ln(0.2*1.94/(1-x)/6.193)=1
    x^2*ln(0.8*1.844/x/1.695)/(1-x)^2/ln(0.2*1.844/(1-x)/6.193)=1
    x^2*ln(0.8*1.544/x/1.695)/(1-x)^2/ln(0.2*1.544/(1-x)/6.193)=1
    V＝14250-6600-（0.155V+446.5118）-2850-783.75
    x^2*ln(0.2*4.679/x/1.695)/(1-x)^2/ln(0.8*4.679/(1-x)/6.193)=1
    y*(30+y)=175
    x^2*ln(0.4*3.777/x/1.695)/(1-x)^2/ln(0.6*3.777/(1-x)/6.193)=1

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