arctan0.026
    arctan0.009
    arctan0.0018
    arctan0.0015
    arctan0.001
    arctan0.0015
    arctan0.002
    arctan0.008
    arctan0.021
    arctan0.003
    arctan0.025
    arctan0.03
    (lg(47.33/23.3))/lg2
    (lg(6/2))/lg2
    1-4.7%
    9702/（1-4.7%）
    9702/1-4.7%
    100-(1+10%)
    （350/5000）*92=
    （400/5000）*92=

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