(20+18.5×1.5+19.8×3.8+19.4×1.8)×0.61-2×29×√0.61
     (20+18.5×1.5+19.8×3.8)×0.61-2×29×√0.61
    （20+18.5×1.5+19.8×3.8）×0.66-2×55×√0.66
    （20+18.5×1.5）×0.66-2×55×√0.66
    (20+18.5×1.5) ×0.70-2×15×√0.70
    1/672.746×1/3 [1.27×(4+1.3-0.857)+83.43×2+60.21×1+527.835×7.5]
    (50.638+90.118)×7.5*0.5
    (50.638+90.118)×7.5
    (55.6+64.82)×1*0.5
    (55.6+64.82)×1
    (29.88+53.55)×2*0.5
    5.74×(1.3-0.857)*0.5
    1/2×[5.74×(1.3-0.857)+(29.88+53.55)×2+(55.6+64.82)×1+(50.638+90.118)×7.5]
     (20+18.5×1.3+19.8×4+19.4×2+18.8×1+18.8×7.5)×0.28-2×0×√0.28
    (20+18.5×1.3+19.8×4+19.4×2+18.8×1)×0.28-2×0×√0.28
    (20+18.5×1.3+19.8×4+19.4×2+18.8×1)×0.49-2×17×√0.49
    (20+18.5×1.3+19.8×4+19.4×2)×0.49-2×17×√0.49
    （20+18.5×1.3+19.8×4+19.4×2)×0.61-2×29×√0.61
    (20+18.5×1.3+19.8×4)×0.61-2×29×√0.61
    (20+18.5×1.3+19.8×4)×0.66-2×55×√0.66

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