484-(154-87)
    484-（154-87）
    0.7×1.43×1100×742=
    1.25×1.1×0.5×435.25×7.5=
    1.25×1.1×0.5×280.82×7.5=
    arctan(0.0284/-0.0114)*180/3.1415
    arctan(0.0137/-0.055)*180/3.1415
    arctan(0.1389/-0.0556)*180/3.1415
    arctan(0.0774/-0.0309)*180/3.1415
    arctan(0.03/-0.012)
    arctan(0.0137/-0.0055)
    1-e-3
    0.25*20%+0.5*11%+0.25*3%
    2.4+5*- 13.4
    99e-e2-25*49
    60*30%=
    16289.59/172774.74= -163986.11/8831.21
    -163986.11/490030.04
    16289.59/470928.55
    -159769.13/145137.17

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