2864.789025/1.839
    2864.789025/3.945
    2864.789025/1.730
    2864.789025/3.170
    50*180/3.1415926
    （arctan2）/2
    -0.5*arctan2
    969581/272890-3
    124+（35-45）
    856-（45-67）
    2^3+（-2）^3-3^2-（-3）^2
    arctan0.1
    (8^20+7^20)^1/20
    32.58*0.09
    1/(0.341*0.09)
    3.41/40
    17*8.034252*8.034252-100
    960/(40+20)
    (1-0.97)*0.65+0.97*(-0.65+0.7)
    (1-0.93)*0.65+0.93*(-0.65+0.7)

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