arctan0.269662921348314
     (20+18.8×1.0)×2.04+2×17×√2.04
    360956160/4.13
    60×313.33×1×(8×300×8)
    -14/5
    √((4-1.652)/3×(1-1.905)+1.905/1.652)
    [24×(tan29.974-tan20.562)+99×(tan23.32-tan20.562)]/2/π
    [24×(tan29.974-tan20.562)+71×(tan23.32-tan20.562)]/2/π
    [24×(tan29.974-tan20.562)+99×(tan23.32-tan20.562)]/2π
    [24×(tan29.974-tan20.562)+71×(tan23.32-tan20.562)]/2π
    arccos[99×cos20.562/(99+2×1×cos14)]
    arccos[24×cos20.562/(24+2×1×cos14)]
    (7.2×(2×6.9-7.2/2)/16+7.2×(2×6.9-7.2/2)/16+7.2^2/16+7.2^2/16）×2+（(7.2×2-2.4)×2.4/8+(7.2×2-2.4)×2.4/8)×2
    (7.2×(2×6.9-7.2/2)/16+7.2×(2×6.9-7.2/2)/16+7.2^2/16+7.2^2/16+(7.2×2-2.4)×2.4/8+(7.2×2-2.4)×2.4/8)×2
    280.67×6.6-1/2×0.48×0.7×6.62-1/6×24×0.7×6.63
    171.09×5.23-1/2×0.52×1.6×5.232-1/6×24×1.6×5.233
    56+89
    2*19.8*2.14
    (20+18.0×0.7+19.4*3.4+19.2*0.8+19.8*4.1+20*1+22*1.6+24*4.3)*0.22-2*25*0.47
    （19.8*2.7+20*1+22*1.6+24*4.3）*4.6+2*24*2.14

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