(20+18.5×1.525+19.8×3.8)×0.61-2×29×√0.61
    （20+18.5×1.525+19.8×3.8）×0.66-2×55×√0.66
    （20+18.5×1.525）×0.66-2×55×√0.66
    (20+18.5×1.525) ×0.70-2×15×√0.70
    1/(602/86)×1/3 [0.76×(4.1+1.2-0.857)+58.254×1.5+86.74×1.5+457.11×6.7]
    (50.59+85.86)×6.7*0.5
    (50.92+64.73)×1.5*0.5
    (29.962+47.71)×1.5*0.5
    4.44×(1.2-0.857)*0.5
    1/2×[4.44×(1.2-0.857)+(29.962+47.71)×1.5+(50.92+64.73)×1.5+(50.59+85.86)×6.7]
    (20+18.5×1.2+19.8×4.1+19.4×1.5+18.8×1.5+18.8×6.7)×0.28-2×0×√0.28
    (20+18.5×1.2+19.8×4.1+19.4×1.5+18.8×1.5)×0.28-2×0×√0.28
     (20+18.5×1.2+19.8×4.1+19.4×1.5+18.8×1.5)×0.49-2×17×√0.49
    (20+18.5×1.2+19.8×4.1+19.4×1.5)×0.49-2×17×√0.49
    (20+18.5×1.2+19.8×4.1+19.4×1.5)×0.61-2×29×√0.61
    (20+18.5×1.2+19.8×4.1)×0.61-2×29×√0.61
    （20+18.5×1.2+19.8×4.1）×0.66-2×55×√0.66
    （20+18.5×1.2）×0.66-2×55×√0.66
    (20+18.5×1.2) ×0.70-2×15×√0.70
    1/611.44×1/3 [2.68×(3.8+1.5-0.857)+40.377×1.8+70.764×1.2+465.324×6.8]

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