(4*3.14/3)[12.5*12.5*12.5*4+3.25*3.25*3.25*60]
    (8.93*12.5*12.5*12.5*4)/(7.845*3.25*3.25*3.25*60)
    (41379-8177*4)/144
    17441*4
    1346.520*60
    144*4+8177*4
    8.93*12.5*12.5*12.5
    5*7.845*3.25*3.25*3.25
    2*8.93*12.5*12.5*12.5
    -3*8.93*12.5*12.5*12.5
    3*8.93*12.5*12.5*12.5
    5*7.845*3.25*3.25*3.25
    （-8）+（-2/3）+0.8+（-1/3）+2/5＝
    arctan（-1/2）
    0.0736/1.0108+0.0736/（1.0108）^2+（0.0736+2.3）/（1.0108）^3=
    0.092/1.0186+0.092/（1.1086）^2+0.092+（1.1086）^3+0.092/（1.1086）^4+（0.092+2.3）/（1.1086）^5=
    5500*0.7*0.7
    arctan（-3/4）
    arctan（-4/3）
    65×65÷66

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