Mathematics
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    200*(1+0.6806)e5
    1.4/2×(86.419+108.17)
    5.3/3×(2×57.5+86.419)/(57.5+86.419)
    5.3/2×(57.5+86.419)
    3.9/3×(2×14.58+57.5)/(14.58+57.5)
    3.9/2×(14.58+57.5)
    (2/3)*30
    (2228.52*10^3)/(0.91*298*10^2*215)+(0.98*277.39*10^6)/(1.15*4.31×10^6*(1-(0.8*2228.52*10^3)/(20059.87*10^3 ))*215)
    1-(0.8*2228.52*10^3)/(20059.87*10^2 )
    (2228.52*10^3)/(0.91*298*10^2*215)+(0.98*277.39*10^6)/(1.15*4.31×10^6*(1-(0.8*2228.52*10^3)/(20059.87*10^2 ))*215)
    (π^2*2.06*10^11*298*10^(-4))/(1.1*52.4^2 )
    1-(0.18*2228.52)/22031.32
    (π^2*2.06*10^11*131117*10^(-8))/(11*1)^2
    (2.275-2.1)×19×1.698+46.911
    (π^2*206*1000*131117*10000)/(11*1000)^2
    (2.275-2.1)×19×1.698
    (19×3.2+9.4×1.4)×1.698+46.911+10×1.4
    sqrt-9/4
    19×3.2×1.698+46.911
    2×18×√1.698

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