85.305=（（0.021*x^1.85+955）^0.5）*x^1.84
    812=（（0.021*x^1.85+955）^0.5）*x^1.84
    10×0.3+10×0.3×0.95×0.99×0.3+10×0.3×0.95×0.99×0.32+....+10×0.3×0.95×0.99×0.3n-1=
    （5-x）:（3-x）=9:7
    X+X/15=600
    X+250+(X+250)/15=600
    X+250+(X+250)/7.5=600
    X+250+(X+250)/5=600
    X+250+(X+250)/0.2=600
    X+250+(X+250)/3.75=600
    X+500+(X+500)/3.75=600
    15*sqrt(0.25x^2+1)/(x*sqrt(x^2+1)*sqrt((0.03x)^2+1))=1
    15*sqrt(0.25x^2+1)/(x*sqrt(x^2+1)*sqrt((0.032x)^2+1))=1
    15*sqrt(0.25x^2+1)/(x*sqrt(x^2+1)*sqrt((0.035x)^2+1))=1
    15/（7.5*sqrt(1+7.5^2)）=1/sqrt(x)
    78.6+11.72y=29.574y+29.758
    5.95+11.72y=29.574y+29.758
    3x^2-5x+4=0
    4x^4+4x^3+x^2-2x-3=0
    2.3897=（（30.56*0.847（x+0.1））/（1+0.847（x+0.1））*（（100-8.28-1.4）/100）*（1/(1+0.31*1.4）+（（2.26（x+0.1））/（1.3*0.101325））

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