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    (20+19.4×1.7+19.2×3.1+19.8×3+20×2.5)×1.90+2×40×1.38
    (20+19.4×1.7+19.2×3.1+19.8×3)×1.90+2×54×1.38
    (20+19.4×1.7+19.2×3.10+19.8×3)×0.61-2×54.0×0.87
    (20+19.4×1.7+19.2×3.10+19.8×1.5)×2.07+2×54.0×1.43
    (20+19.4×1.7+19.2×3.10)×2.07+2×31×1.43
    (19.8×2.7+20×1)×0.50+2×40×0.71
    (19.8×2.7)×0.50+2×54×0.71
    2×54×0.7
    (20+18.0×0.7+19.4×3.4+19.2×0.8+19.8×4.1)×0.61-2×54×0.87
    (20+18.0×0.7+19.4×3.4+19.2×0.8)×0.61-2×31.0×0.78
    (20+18.0×0.7+19.4×3.4)×0.61-2×42.4×0.78
    (20+18.0×0.7+19.4×3.4)×0.6-2×42.4×0.78
    (20+18.0×0.7)×0.6-2×10×0.78
    (20+18.0×0.7)0.70-2×31×0.84
    (19.8×2.7)×0.48+2×54×0.7
    (20×0.48×2.61^2)/2×(19.8×0.48×2.61^3)/6
    15.402627+110.954+72.03945
    (20+19.4×1.79+19.2×2.9+19.8×3.4)×0.61-2×31×0.87
    (20+19.4×1.79+19.2×2.9+19.8×1.79)×0.61-2×31×0.87
    (20+19.4×1.79+19.2×2.9+19.8×3.4)×0.52-2×54×0.72

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