(12.72 × 10.36 − 56.22) × 4.5
    1.21*0.5+0.01*0.1+0.81*0.2+1.9*1.9*0.2
    1.21*0.5*0.01*0.1+0.81*0.2+1.9*1.9*0.2
    (2×3.14×8^2)/(300×100×4)=
    5.283185/19.7396
    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

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