18%*79.5%+5%*20.5%*(1-19%)=
    19.21×2.78+528×2.2
    627*(1+1.8%)/(18%-1.8%)
    19.21×4+528×2.2
    -10-5
    -10+5
    2*500*0.08^2/(sqrt(3)*0.1^2)-375*0.05^2/(0.1^2-0.05^2)*2
    2*500*0.087^2/(sqrt(3)*0.1^2)-390*0.05^2/(0.1^2-0.05^2)*2
    2*500*0.0819^2/(sqrt(3)*0.1^2)-380*0.05^2/(0.1^2-0.05^2)*2
    2*500*0.0781^2/(sqrt(3)*0.1^2)-370*0.05^2/(0.1^2-0.05^2)*2
    2*500*0.0749^2/(sqrt(3)*0.1^2)-360*0.05^2/(0.1^2-0.05^2)*2
    2*500*0.0721^2/(sqrt(3)*0.1^2)-350*0.05^2/(0.1^2-0.05^2)*2
    2*500*0.0696^2/(sqrt(3)*0.1^2)-340*0.05^2/(0.1^2-0.05^2)*2
    2*500*0.0674^2/(sqrt(3)*0.1^2)-330*0.05^2/(0.1^2-0.05^2)*2
    2*500*0.0654^2/(sqrt(3)*0.1^2)-320*0.05^2/(0.1^2-0.05^2)*2
    2*500*0.0635^2/(sqrt(3)*0.1^2)-310*0.05^2/(0.1^2-0.05^2)*2
    2*500*0.0617^2/(sqrt(3)*0.1^2)-300*0.05^2/(0.1^2-0.05^2)*2
    2*500/sqrt(3)*(1+ln(0.087/0.05))-390-390*0.05^2/(0.1^2-0.05^2)*((0.1^2/0.087^2)+1)
    2*500/sqrt(3)*(1+ln(0.0819/0.05))-380-380*0.05^2/(0.1^2-0.05^2)*((0.1^2/0.0819^2)+1)
    2*500/sqrt(3)*(1+ln(0.0781/0.05))-370-370*0.05^2/(0.1^2-0.05^2)*((0.1^2/0.0781^2)+1)

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