atan(1/0.7)
    (22.4*2200*105.33-1260*3*1260)/330
    √136
    6*6+10*10
    5×10^17÷4×10^-4
    sqrt4
    12%=
    （60×1.1+1.5）×10/0.86/4
    （36+1.5）/2×10/（0.86）/2
    （36+1.5）/2×10/（0.7）/2
    15000/25.4
    0.2+0.5*0.589^2
    4*3.14/3（12.5*12.5*12.5*2.646+3.25*3.25*3.25*140）
    4*3.14/3（12.5*12.5*12.5*3.5+3.25*3.25*3.25*89）
    8.93*12.5*12.5*12.5*2.364/(7.845*3.25*3.25*3.25*153)
    0.05+0.9*0.52777^2
    8.93*12.5*12.5*12.5*2.646/(7.845*3.25*3.25*3.25*139)
    8.93*12.5*12.5*12.5*2/(7.845*3.25*3.25*3.25*139)
    8.93*12.5*12.5*12.5*3.5/(7.845*3.25*3.25*3.25*89)
    (41379-8177*1.949)/144

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