(2.34%×66.72)/2.08
    (60-2)/2+(68.9-45.0)/2
    (60.3-12.1)/2+(68.71-44.65)/2
    220495.7/7745
    65×3200
    13+(8+14)÷2
    (69.59%×0.57)/2.08
    (75.09%×2.64)/2.08 (9.70%×17.13)/2.08
    (24.19%×0.39)/2.08
    ((779.8-510)×10^3×25000)/(2×2.1×10^5×7745)-(10.56×25000^2)/(8×2.1×10^5×7745)
    ((8.02.8-510)×10^3×25000)/(2×2.1×10^5×7745)-(10.56×25000^2)/(8×2.1×10^5×7745)
    3543087.6/1.25
    112133.77/(300×1255)×1.6
    112133.77/(300×1100)×1.6
    -[(4×1100^2+3×2600^2-12×2600×550-8×1100×550)/(4×(3×2600+2×1100))]×112133.77
    1/(4×0.001182)×105441
    1/(4×105441)×96884
    1/(4×0.001182)×85237
    0.00194*15^2+11.1808/15^2
    2+1－2+2

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