K=1574+31.48+0.01K+35.92+0.0002K+82.07+0.0005K+0.0529K
    3150-3150*sqrt(1-x^2)+1287.1*x = 925
    0.507*（50+6.8x）-0.493*(40+8.5x)=0
    1.925X+(1000/135)*(940-X)=2860
    1.925X+(1000/126)*(940-X)=2860
    3088-3088*sqrt(1-x^2)+1228.6*x=895
    K=1416.5+28.33+0.01K1+32.3+0.0002K+73.86+0.0005K+0.0532K
    1390*x+3162.3*x^2/sqrt(1-x^2)-1390*x/sqrt(1-x^2) = 895
    V=1125.89+80.00+36.18+0.01V+51.48+0.0002V+77.61+0.0006V+0.0532V
    1194*x+3084.5*x^2/sqrt(1-x^2)-1194*x/sqrt(1-x^2) = 928
    1.925X+(1000/126)*(850-X)=2380
    1194*x+3084.5*x^2/sqrt(1-x^2)-1194=928
    500+X/44.7=204(1+X)
    1000+X/44.7=204(1+X)
    1/（d+1）+1/（d+3）+1/d=0
    x/(2000+x)=20%
    x*x*x+x=3
    520+480/x=-0.04(175-2000x)^2+14(175-2000x)
    x*x*x+x=3
    1/（d+1）+1/（d+3）=1/d

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