(246.9×10^6×160)/102400
    √((48.98/253.23)^2+(411.5/408.5)^2 )
    (246.9×10^6×150)/90000
    195.9/4
    1865.2/4
    (-195.9×10^3)/(0.9×0.55×300)+(1865.2×10^3)/(0.8×0.78×300)+(246.9×10^6)/(1.3×0.9×0.78×300×340)
    (195.9×10^3)/(0.9×0.55×300)+(1865.2×10^3)/(0.8×0.78×300)+(246.9×10^6)/(1.3×0.9×0.78×300×340)
    (195.9×10^3)/(0.9×0.55×300)+(1865.2×10^3)/(0.8×0.78×300)+(246.9×10^6)/(1.3×0.9×0.78×300×340)
    (68.3×10^3-0.3×1865.6×10^3)/(0.9×0.55×300)
    0.4×1865.6×0.48
    0.5×23.1×400×640
    10.663-(2.430+4.306)/2
    (2191.5×10^3)/(0.995×20479.8×215)+(1.0×144.4×10^6)/(1.05×2865986.06×(1-(0.8×2191.5)/1508080.55)×215)
    (π^2×2.06×10^5×20479.8)/(1.1×〖5.01〗^2 )
    150/11.5
    889/177.45
    6.518-4.170
    ［2046×（1+0.0518）×1.1168×1.34+0］×0.9912
    ［2046×（1+0.0518）×1.1168×1.3612+0］×0.9912
    ［2046×（1+0.0518）×1.1168×1.3612+0］×0.9912

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