（1280-300-400）/（1500-300）×100%
    (ln100000000000000000000)/(100000000000000000000^(0.5))
    arccos(cos(45) sin(45) cos(45) sin(45) + sin(45) sin(45) sin(45) sin(45) sin(45) sin(45))
    atan2
    350*12
    76864/4096
    (ln1000)/(1000^(0.5))
    ln2/2^(0.5)
    (1.111168)^(0.5)
    ln1.111168
    2864.789025/1.842
    2864.789025/4.538
    2864.789025/1.850
    2864.789025/3.971
    2864.789025/1.839
    2864.789025/3.945
    2864.789025/1.730
    2864.789025/3.170
    50*180/3.1415926
    （arctan2）/2

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