680÷17
    340÷17
    170÷70
    1+2^-2*(abs0.064)^(1/3)-(9/4)^(1/2)
    2020ln2022-2021ln2021
    2022ln2020-2021ln2021
    2022ln2020-2020ln2022
    0.8532*2000000/42000
    0.9255*0.3814/0.4137
    (15*0.0138-(0.013)^2)/(1/2)
    （15*0.0097-0.003^2）^（1/2）
    （15*0.0107+0.013*0.003）/((15*0.0138-0.013*0.013)(15*0.0097-0.003*0.003))^(1/2)
    arctan-0.0028
    arctan32.05
    arctan0.0027
    arctan41.86
    arctan-0.685
    arctan22.428
    arctan0.685
    arctan0.502

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