（x-36.79)/x=0.2
    4x+6x²-1=0
    （x-268.94)/x=0.2
    1607.68=(3/5*x)/(0.8*300)
    1607.68=(4/5*x)/(0.85*0.686*300)+(3/5*x)/(0.8*300)
    480x^3-22x-5=0
    200000=1.75/4*1.43*300*630+360*x*630-0.2*150000
    0.01+x=5（0.3-x）（0.1-x）
    x(1+x)^2=400
    -2(x+1)^2=10
    -2(x+1)^2
    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

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