K=2023+101.15+0.04K+145.76+0.0026K+340.48+0.0064K+0.0565K
    4.52X*(1-sin(2πX)/(2πX))+3X-1.25=0
    3X+1=0
    267.06371*[1+0.022[n*(n-1)/2]]=1800000
    x=5+7
    K=2023+101.15+0.04K+145.76+0.0026K+340.48+0.0064K+0.0565K
    0.04K*[(1+0.0435)^1.5-1]
    (x+40927.84-15000)*0.1-2520=x-20000+927.84
    (x+40927.84)*0.1-2520=x-20000+927.84
    x+(5-x)/(x-2)=2*(x+1)^(1/2)
    401.06x＾2＋1365.79x＋1616.54＝0
    160=-0.0023x^2+1.7786x+5.5427
    120=-0.0023x^2+1.7786x+5.5427
    80=-0.0023x^2+1.7786x+5.5427
    50=-0.0023x^2+1.7786x+5.5427
    50=-0.0023x
    sinx=0.8x
    sinx=0.9x
    sinx=0.95x
    47×a=20.9

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