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
    4x=16+4/5x
    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)
    0.5*（39.13+13.7x+38.13)*x*(2*38.13+13.7x+39.13)*x/3*(39.13+13.7x+38.13)+20.61x=0.5*(70.25+45.65x+70.25)*x*(2*70.25+45.65x+70.25)*x/3*(70.25+45.65x+70.25)
    0.5*（39.13+13.7x+38.13)*x*(2*38.13+13.7x+39.13)*x/3*(39.13+13.7x+38.13)+20.61x=0.5*(70.25+45.65x+70.25)*x*(2*70.25+45.65x+70.25)*x/3(70.25+45.65x+70.25)
    0.5*（39.13+13.7x+38.13)*x*(2*38.13+13.7x+39.13)*x/3*(39.13+13.7x+38.13)+20.61x=0.5*(70.25+45.65x+70.25)*x*(2*70.25+45.65x+70.25)*x/3(70.25+45.65x+70.25)
    0.5*（76.26+13.7x)*x*(114.39x+13.7x^2)/(114.39+41.1x)+20.61x=0.5*(140.5+45.65x)*x*(210.75x+45.65x^2)/(210.75+136.95x)
    0.5*（76.26x+13.7x^2)*(114.39x+13.7x^2)/(114.39+41.1x)+20.61x=0.5*(140.5x+45.65x^2)*(210.75x+45.65x^2)/(210.75+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+136.95)x
    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+136.95)x

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