1144125032744/47533
    114125032744/47533
    2019÷2020÷2021
    5.02*101-5.02
    2^7
    5e6
    63000/1.105+66000/1.105/1.105
    arctan(1.5)
    arctan4+arctan(-1.5)
    arctan 4+arctan(-2/3)
    arctan4+arctan(-2/3)
    arctan2
    arctan 2
    ［2046×（1+0.0518）×1.0839+0］×0.9902
    ［2046×（1+0.0518）×1.0839+0］×0.9902
    ［1-1/（1+6.50%）^60.70］/［1-1/（1+6.50%）^70］
    ［2046×（1+0.0518）×1.0839+0］×0.9813
    1.02^4.07
    (1.2×1200)/(3.87×0.8×2)
    1200/(5.8×0.8×2)

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