e^(ln2/2)
    1/5(1.4980/0.2981+0.6902/0.1373+0.3745/0.0745+1.7726/0.3527+0.6902/0.1373)=
    1/5(1.4908/0.2981+0.6902/0.1373+0.3745/0.0745+1.7726/0.3527+0.6902/0.1373)=
    0.370193 * 2.718281828459 ^ ( -1.2 )
    0.033583 * 2.718281828459 ^ ( -1.2 )
    36000/2*0.4*(80+0.4)^3
    2.9442*10^11/(20-72360000/3.2/(80+0.4)^2)
    sqrt39
     36000/2*79.990957*(80+79.990957)^3
    2.9442*10^11/(20-72360000/3.2/(80+79.990957)^2)
    sqrt135
    36000/2*79.990957*(80+79.990957)^3
    1350*670^2*1195*(3-670/1195)*1/6/[20-1350*670*80/3.2/(80+79.990957)^2]
    36000*(79.990906-80)*79.990906^3/2
    (20-1350*670*80/3.2/79.990906^2)^(-1)*1350*670^2*1195*(3-670/1195)*1/6
    5-4/3
    2-2
    76×36+76×64
    （25.0468-22.2944）/（25.0438-20.9886）
    （24.6592-23.1448）/（24.6592-22.4156）

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