1.71×2.2 ×128549359
    1/2×1600×542^2-1/2×(1600-200)×(542-120)^2
    (2×109800000)/128549359
    124299025417/(1500-542)
    1/2×1600×540^2-1/2×(1600-200)×(540-120)^2
    30000×4748215830
    123407384759/(1500-540)
    0.95×30000×124299025417
    31500×38660797105
    1/12×200× 1500^3+200×1500×(1500/2-542)^2+1/12×(1600-200)×120^3+(1600-200)×120×(542-120/2)^2+(6.667-1)×3770×(1403-542)^2
    (1/2×200×1500^2+1/2×(1600-200)×120^2+(6.667-1)×3770×1403)/489365
    200×1500+(1600-200)×120+(6.667-1)×3770
     0.95×31500×123407384759
    1/12×200× 1500^3+200×1500×(1500/2-540)^2+1/12×(1600-200)×120^3+(1600-200)×120×(540-120/2)^2+(6.349-1)×3770×(1403-540)^2
    (1/2×200×1500^2+1/2×(1600-200)×120^2+(6.349-1)×3770×1403)/488166
    200×1500+(1600-200)×120+(6.349-1)×3770
    (1600×205^3)/3-((1600-200)×(205-120)^3)/3+6.349×3770×(1403-205)
    1+0.5×930 1061.10
    1.00×1.44×1.00×232/2.00×10^5(35+28.60/0.36+1.7×0.0982)＝
    724.00+437.00×0.4+78.00×0.4

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