(168.4×10^3)/(0.567×912×305)
    (168.4×10^3)/(0.955×912×305)
    (22.5×10^6)/(1.0×237000×215)
    1.07-〖42.45〗^2/(44000×1)
    900/21.2
    cos0
    cos90
    cos35.906
    cos35.9060
    cos35.9060
    161.4389*cos35.9060
    1+1=
    ln19999/ln10000
    ln19999/ln10000-ln20001/ln10001
    ln199/ln100-ln201/ln101
    ln9/ln5-ln11/ln6
    ln7/ln4-ln9/ln5
    ln7/ln4
    lg0.5-lg0.28728
    lg2+lg5

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