8000/(x+12.12)+10000/x+10000/x
    （38.13+13.7x+38.13)*(2*38.13+13.7x+38.13)/(228.78+41.1x)+41.22x=(70.25+70.25+45.65x)*(2*70.25+45.65x+70.25)/(421.5+45.65x)
    （38.13+13.7x+38.13)*(2*38.13+13.7x+38.13)/(228.78+41.1x)=(70.25+70.25+45.65x)*(2*70.25+45.65x+70.25)/(421.5+45.65x)
    120x = 100（x+4）+80
    100x = 120（x+4）+80
    100x = 120（x-4）-80
    100x = 120（x+4）-80
    100x = 120（x-4）+80
    100x = 120（x-4）-80
    100x=120（x-4）-80
    2x（40-4x）=288
    （76.26+13.7x)*(114.39+13.7x)/(228.78+41.1x)+41.22=(140.5+45.65x)*(210.75+45.65x)/(421.5+136.95x)
    [100-2（x-50）]（x-40）=1350
    （76.26+13.7x)*(114.39+13.7x)/(228.78+41.1x)+41.22=(140.5+45.65x)*(210.75+45.65x)/(421.5+136.95x)
    （76.26+13.7x)*(114.39+13.7x)/(228.78+41.1x)+41.22=(140.5+45.65x)*(210.75+45.65x)/(421.5+136.95x)
    （76.26x+13.7x^2)*(114.39x+13.7x^2)/(228.78+41.1x)+41.22x=(140.5x+45.65x^2)(210.75x+45.65x^2)/(421.5+136.95x)
    （76.26x+13.7x^2)*(114.39x+13.7x^2)/(228.78+41.1x)+41.22x=(140.5x+45.65x^2)(210.75x+45.65x^2)/(421.5+136.95x)
    0.5*（76.26x+13.7x^2)*(114.39x+13.7x^2)/(228.78+41.1x)+20.61x=0.5*(140.5x+45.65x^2)(210.75x+45.65x^2)/(421.5+136.95x)
    0.5*（76.26x+13.7x^2)*(114.39x+13.7x^2)/(114.39+41.1x)+20.6x=0.5*(140.5x+45.65x^2)(210.75x+45.65x^2)/(210.75+136.95x)
    0.5*（39.13+13.7*x+38.13)*x*(2*38.13+13.7x+39.13)*x/3*(39.13+13.7x+38.13)+20.61x-0.5*(70.25+45.65*x+70.25)*x*(2*70.25+45.65x+70.25)*x/3*(70.25+45.65x+70.25)=0

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