(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
    （20+18.5×1.3）×0.66-2×55×√0.66
    （20+18.5×1.3）×0.66-2×16×√0.66
    (20+18.5×1.3) ×0.70-2×15×√0.70
    1/667.565×1/3 [10×(3.3+2.1-0.857)+79.23×1.9+143.539×2.2+434.79×6]
    (56.67+88.26)×6*0.5
    (55.11+75.38)×2.2*0.5
    (30.46+52.94)×1.9*0.5
    16.1×(2.1-0.857)*0.5
    (18.5×2.1×1.52)+2×16×√1.52
    49/36
    1/2×[16.1×(2.1-0.857)+(30.46+52.94)×1.9+(55.11+75.38)×2.2+(56.67+88.26)×6]
    4^0.222392
    2.807355-2.584963
    19/8*1/2-1/4

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