188*(1-67%)
    209*(1-67%)
    209-[209*(1-67%)]
    209-(209*67%)
    1-[62.04*(1-50%)]/209
    （0.25）^-3
    3∧π
    arctan(1.4÷0.95)
    arctan(1.4÷0.95）
    arctan1.4
    (2.02*(2.47-2.02))/(2.47*(2.47-2.02))
    3.321928*lg224-2.954
    3.321928*lg209-2.954
    36*lg10
    36*lg10
    lg10
    10 lg(10^0.1*0.75+10^0.1*0.75+10^0.1*0.90)
    1212121/0.9089888
    19890604+1
    166512+235298

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