900×0.25×[(652/464-1)+√((652/464-1)^2+0.25×(8×0.5×652/464)/464)]
    0.5×214×(1-45/214)^2/(1-1×45/214)
    e^0.1947
    10-439.9/900-(0.4+0.04)×29.7
    (250×2.75)/√29.7
    (250×2.75)/√28
    (250×2.75)/√39
    e^0.8737
    1.22×2.75^2×√29.7
    13260/(9.81×2.75^2×29.7×√29.7×0.8995)
    ln(112.3/84.58)+0.444×(1-2×0.6)
    9.81×2.75^2×29.7×√29.7×0.8995
    ln(112.3/84.58)+0.444×0.2×(1-2×0.6)+0.8×(1.05-0.29)
    0.283476-0.01776+0.8×(1.05-0.29)
    0.283476-0.01776+0.8×(1.05-029)
    -0.444×0.2×0.2
    0.12/0.2×2
    ln(112.3/84.58)
    4.5/1.73×［0.871×（1.73/4.5）^1.382-0.038］
    arctan（1/0.75)

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