39/0.8/2*（1-1/((1+0.8/2)^2*20)+1000/((1+80%/2)^2*20)
    5/(（1+11%）^4)+(5*1.2)/((1+11%)^5)+(5*1.2^2)/((1+11%)^6)+(5*1.2^2)/11%/((1+11%)^6)
    33^5/35
    33^3/35
    8^3/33
    8^3/34
    e-0.3
    e-0.5
    8^3/20
    e-1.5
    e-2
    e0.1
    e0.25
    33^7/209
    33^7
    10-10*cos52.43
    10-10*cos72.43
    arctan0.666
    arctan1.5
    e0.527447-0.527447

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