2π-1
    9.8698*2
    π^2
    （2π-1）/2π^2
    π^（1/π）
    sin(1/π)
    1×14.3×1000×0.003×360/360
    (1×4.90×10^6)/(1×14.3×1000×360^2 )
    1×14.3×1000×120×(360-120/2)
    1×14.3×300×0.008×710/360=
    1*14.3*2500*0.011*710/360
    158×(1-0.55)/(1-0.55*1.15)×2143/3600
    0.25×2213.4[(0.97-1)+√((0.97-1)^2+(8×(0.97-0.5))/2213.4)]
    0.25×2213.4[(0.97-1)+√((0.97-1)^2+(8×(0.97-0.5))/2213.4)]
    158×(1-0.55)/(1-0.55*1.15)×1978/3600
    0.25×2418.2[(0.8-1)+√((0.8-1)^2+(8×(0.8-0.5))/2418.2)]
    sin30
    158×(1-0.42)/(1-0.42*1.15)×1644/3600
    0.25×957.7[(1.7-1)+√((1.7-1)^2+(8×(1.7-0.5))/957.7)]
    353+84

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