arctan0.70
    arctan1.43=
    1862784/0.75/14.3=
    3396880/0.75/14.3=
    1.6×14×15×6×1.05×1.1×0.8=
    1.6×14×30×6×1.05×1×0.8=
    sin90
    sin0
    sqrt2
    sqrt4
    √3
    √3
    log（2，8）
    √9
    √9
    22/70*100%
    3600-（5000/20）-50*50%=
    4/3*3.14*216
    （220/86400）*（0.101325/13.48）*（0.6836/293）*345.3
    4/3*3.14

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