2/3×14.3×400^3×（sin（3.14×0.417））^3+360×1885×400×（sin（3.14×0.417）×2）/3.14
    2/3×14.3×400^3×（sin（3.14×0.417））^3
    1483.241+0.5×25×π×〖0.5〗^2×20.2
    2/3×14.3×0.4^3×（sin（3.14×0.417））^3
    1/2×3.299×[(1.49×25)+(1.56×40)+(6.22×22)+(10.93×60)]+0.75×0.8×0.785×[330+1.5×8×(20.2-3)]
    1483.241+0.5×25×π×〖0.5〗^2×20
    1483.241+0.5×25×π×1^2×20
    1/2×3.299×[(1.49×25)+(1.56×40)+(6.22×22)+(10.73×60)]+0.75×0.8×0.785×[220+1.5×8×(20-3)]
    1/2×3.299×[(1.49×25)+(1.56×40)+(6.22×22)+(5.73×60)]+0.75×0.8×0.785×[220+1.5×8×(15-3)]
    4986.66/12
    (789.225+3163.68+5647.875+3567.428)/12+306.51+79.38
    0.36*30
    2/3*14.3*400^3×（sin（3.14×0.417））^3+360×1885×400×（sin（3.14×0.417+sin（3.14×0.416）/3.14
    2/3*143*1000×0.4^3×（sin（3.14×0.417））^3+360000×0.001885×0.4×（sin（3.14×0.417+sin（3.14×0.416）/3.14
    2/3*14.3*1000×0.4^3×（sin（3.14×0.417））^3+360000×0.001885×0.4×（sin（3.14×0.417+sin（3.14×0.416）/3.14
    2/3*1.43*1000×0.4^3×（sin（3.14×0.417））^3+360000×0.001885×0.4×（sin（3.14×0.417+sin（3.14×0.416）/3.14
    2/3*1.43*1000×0.4^3×（sin（3.14×0.417））^3+360000×0.001885×0.4×（sin（3.14×0.417+sin（3.14×0.416）/3.14=
    (10000×1.8)/(0.8×3×10^7×0.0491)
    0.409×15
    (10000×1.355)/(0.8×3×10^7×0.0491)

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