（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
    30413/4.8%×（1-1/（1+4.8%）^16.58)×(1/(1+4.8%)^8)
    22778/(4.8%-3.5%)×(1-((1+3.5%)^8/(1+4.8%)^8))
    36.98×12×55.92
    26200÷12÷60
    24104÷12÷55=

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