((((1-1.08^(-5))/(0.08/1.08)-5*1.08^(-5))/0.08)*1000)/(1+0.02*((1-1.08^(-5))/0.08))
    （（4000000*4000000+2800000*2800000）^0.5）/（80*80*80*3.1415926/32）
    (x+510)*arctan(2505/x)=3850/2
    ((((1-1.08^(-5))/(1/1.08)-5*1.08^(-5))/0.08)*1000)/(1+0.02*((1-1.08^(-5))/0.08))
    x-5/12=3/8
    x^2.5-0.718x-0.753=0
    2*3.14*（x+510)*arctan(2505/x)/360=3850/2
    (0.1X+0.2)/0.02-(X+1)/0.5=3
    [（76-12857x）^2]*(12933+13377+x)=5.28*12933*(13377+x)*(76+x)*26371
    2*3.14*（x+510)*arctan(2505/x)=3850/2
    （76-12857x）^2*(12933+13377+x)=5.28*12933*(13377+x)*(76+x)*26371
    x^3+5*x^2+7*x+3=0
    {（10000+5500x）×0.16x－1000}×5x=10000
    (1+r)^6=37489/30000
    X+X/21.75/8*32*2=6000
    x(x+1)=2
    19.6x^2-50x+32.6=0
    x^3-3x^2+2x+1=0
    -8+3/x+2.8/(x^2)+2.6/(x^3)+2.4/(x^4)+2.3/(x^5)=0
    (1+r)^6=1.25

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