arctan0.001×841＝
    6-8/5
    (4×0.01645)/(π (20/1000)^2 )
    19.5×0.62=
    9.09×0.62=
    cos180
    arcsin3/5
    49.71×π/4 (〖0.025〗^2-〖0.02〗^2)/(π×0.025×0.0025)
    2.598+47.11
    2.812+94.22
    97.498-39.53
    (39.53-25)×5×1.112×10^(-5)
    0.009×210000×194000 (1.112×10^(-5) (39.53-25)-1.153×10^(-5) (97.498-25))/(210000×0.018+194000×0.009)
    0.018×210000×194000 (1.112×10^(-5) (39.53-25)-1.153×10^(-5) (97.498-25))/(210000×0.018+194000×0.009)
    (59.75+19.31)/2
    35-373.56×(1/5272.72+5.28×10^(-4) )×58.51
    97.5-373.56×(1/643.23+1.72×10^(-4) )×58.51
    0.55×(462+3)/(2×3)
    49.31×π/4 (〖0.025〗^2-〖0.02〗^2)/(π×0.025×0.0025)
    2.598+46.71

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