80.81+18.3
    (267.63×103)/ 341.09
    341.09×10×0.003
    33.17×1×1.25×7/(sin45)
    920.87×1.25
    109.12×1.25
    115.90×1.25
    98.75×1×1.25
    (20×0.52×1.67^2)/2×(19.8×0.52×1.67^3)/6
    (20+18.0×1.6+19.2×2.4+19.8×5.2+20×0.4)×0.52-2×40×0.72
    (20+18.0×1.6+19.2×2.4+19.8×2.9)×0.48-2×54×0.70
    (20+19.8×2.9+19.2×0.4)×1.90+2×40×1.38
    (20+19.8×2.7+20×1+22×0.9+24×5.3)×4.59+2×25×2.14
    (20+19.8×2.7+20×1+22×0.9)×4.59+2×20×2.14
    (20+19.8×2.9+19.2×2.1+22×0.9)×3+2×20×1.73
    (20+19.8×2.9+19.2×2.1)×3+2×40×1.73
    (20+19.8×2.9+19.2×2.1)×1.90+2×40×1.38
    (20+19.8×2.9)1.90+2×54×1.38
    2×54×1.43
    （19.8×2.9）×2.07+2×54×1.43

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