44.27*19.63/3.87
    0.01775/（1+0.0377*9+0.000221*81）
    0.01775/1+0.0377*9+0.000221*81
    389—926329
    2*sqrt1700/[31*sqrt31)
    2/[31*sqrt31*sqrt1700)
    sqrt0.039226
    (31*9.8/1700)*(31*9.8/1700)+(2*9.8/31)*(2*9.8/31)/(1700/31)
    sqrt(0.002155)
    [(30+1)/1700]*[(30+1)/1700]+(9.8/31)*(9.8/31)/(1700/31)
    0.5*(22*10^-3)*0.24*0.24*(3.1415926/3)*(3.1415926/3)
    2465000*（1+0.1）^24
    (1444.965×10^3)/(0.877×150.4×10^2 )
    √（3+6）
     480/18.521
    (1444.965×10^3)/(0.903×150.4×10^2 )=
    √(51593.95/150.4)
    591.624+99.792+743.549+10
    0.1×(3358.7+4076.79)
    1.25×1.1×4×(0.8×10.8+0.88×10.8)

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