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
    0.589×(18.7×3.9+19×(9.2-3.9)+9.4×(3.9+6.7-9.2)+20)+10×(3.9+6.7-9.2)-27.629
    0.589×(18.7×3.9+20)-27.629
    (2228.52*1000)/(298*100)+(277.39×10^6)/(1.15*4.31×10^6 )
    (2228.52*1000)/(2.98*100)+277.39/(1.15*4.31×10^6 )
    2×6×√1.371
    0.729×(18.7×3.9+20)-10.246
    0.729×20
    2×6×√0.729
    0.704×20
    2×8×√0.704
     0.65*0.7 +16

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