4-3（100-80）^2/1600
    4-3(100-94)^2/1600
    log（6，5）
    4-3(100-94)^2/1600
    arctan(9/8)
    arctan1.5
    207000/(0.614×9573×215)
    207000/(0.614×9573)
    50sin72
    50cos72
    1÷15
    ln0.4＝
    70÷2+70 =
    75÷2+75 =
     7863783781983819*37829483772772
    √12
    2arctan(4/10)
    2arctan(0.04/100)
    arctan(-7.33)
    arctan(-7.33)

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