0.9*1*[24.4*1000*600+400*2512]
    0.9*1*[24.4*1*6+400*2512]
    2512/1000/600
    4775/173.2
     13.5*13.5*π*5
    13.5*13.5*π
    3246.023*4.180358-24.4*1*0.52*0.52*0.47*（1-0.5*0.47）
    （5014.5+22501.5）*2.9648*1.8*2.6*5.57*2.5*7
    3246.023*4180.358-24.4*1000*520*520*0.47*（1-0.5*0.47）
    3/e
    1.001608*3954-600/2+80
    1.001608-600/2+80
    1.001608×3954+600/2-80
    (5477.7700×1.1623)/(1/8×3600×1.2^2 )=
    (5477.77×1.1623)/(22×3600)
    0.04234×208.96×63.10
    19.77×3.499^0.608×10^-3
    19.77×3.499^0.608×10-3
    19.77×3.4990.608×10-3
    (5477.7700×(1+0.00711 ))/(0.438×3600)

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