x^2-8x+15=0
    850000=1/0.85*((1.05)/(4)*1.89*600*560+360*x*560+0.056*2000000)
    (x-1)/(1000-800)=(0.9-x)/(2000-1000)
    0.007954/x＝0.1289/0.86289
    0.4/100.58＝x/2
    x^2-17x+72＝0
    140=(1+(0.5*0.5)/(1.13*x*1.13*x)*2)*120
     R^2 = 18.51^2+（R-7.23）^2
     R^2 = 18.51^2+（R-7.23）^2
    R^2=18.51^2+（R-7.23）^2
    R2=18.51^2+（R-7.23）^2
    R2=18.51^2+（R-7.23）^2
    s^2+8s-4=0
    2x（2-2x）＝0.00658*300（0.3-x）^1/2（0.9-3x）^3/2
    2x（2-2x）＝0.00658*300（0.4-x）^1/2（1.2-3x）^3/2
    2x（2-2x）＝0.00658*300（0.46-x）^1/2（1.38-3x）^3/2
    6*(10^24)*((384400-x)^2)=7*(10^22)
    (a-1)^2=3
    2x（2-2x）＝0.00658*300（0.15-x）^1/2（0.45-3x）^3/2
    a-1=2

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