-1220.561*10^6*19960^2/(8*0.95*3.45*10^4*197925113037.83)
    1714.030*10^3*712.1
    (1829.858*10^3*(1035.4-215.5)-115.828*10^3*(1035.4-45))/(1829.858*10^3+115.828*10^3)
    √5
    113.78*1018
    1105.55*1668*0.9923+1105.55*0
    1164.31*1668*0.9951+1164.31*834
    1105.55*1668*0.9923+1105.55*0-113.78*1018
    （ln（5.810817））/（2+sin（4.810817））
    1.43*5/48*19960^2/(0.95*3.45*10^4)*( 957.75+384.53)*10^6/223405991568.39
    19960/600
    1.43*3.5
    5/48*19960^2/(0.95*3.45*10^4)* 613.73*10^6/223405991568.39
    26700+w*(1-10%/4)=50000
    26700+w*(1-10%/4)≥50000
    4.559939-2.130528
    67.02*10^6*(608.9-1200)/206592415464.42+(221.38+460.29)*10^6*(564.6-1200)/223405991568.39
    67.02*10^6*(608.9-564.6)/206592415464.42+(221.38+460.29)*10^6*(564.6-564.6)/223405991568.39
    0.339443-0.544027
    0.439314-0.544027

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