2^(-1)=
    2*（-1）=
    80000/0.06*(1-1/1.06^25)
    1/(1+1.0×(0.4×3.73105116)/(2.204941841)×(2.8)^2 )
    (4×〖3.6〗^2×〖2.66〗^2)/(3.6×(1/0.2+1/0.25)+(2×2.66)/0.40)+2×0.2805×1.0×〖0.25〗^3
    (179×10^3×279.5-1.0×14.3×500×25.0×(465-25.0/2))/(300×(465-35) )
    64.5+500/2-35
    (179×10^3)/(1.0×14.3×500)
    (179×10^3)/(14.3×500×500)
    1.25×[(0.6×0.6×6.2)×25×2+0.5×0.5×5×25]
    (357×10^3×251.2-1.0×14.3×500×49.9×(465-49.9/2))/(300×(465-35) )
    36.2+500/2-35
    (357×10^3)/(1.0×14.3×500)
    (5.8×10^3)/357
    (357×10^3)/(14.3×500×500)
    2.5/(0.289×0.5)
    1.25×[(0.6×0.6×8+0.6×0.7×5.25)×25×2+0.5×0.5×5×25]
    1.25×[(0.6×0.7×7)×25×2+0.5×0.5×5×25]
    1.25×[(0.6×0.7×7)×25×2×2+0.5×0.5×5×25]
    e^1

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