0.555*(0.8405*10^12/8.82*0.001)^0.25
    0.0557^3*909.1^2*9.81*103790/(1.73*10^-4)
    0.45*（2.57/0.982）*922^0.625*（0.477393/0.028794）^-0.375*0.698^0.33
    0.45*2.617*71.27*0.34886*0.888
    0.698^0.33
    （0.477393/0.028794）^-0.375
    922^0.625
    922^0.65
    2.57/9.82
    0.45*(2.57/0.982)*922^0.65*(0.477393/0.28794)^-0.375*0.698^0.33
    3.14*(9.52-0.35)
    3.14*8.65
    5.404*2.9/17
    3*1.75*25/(1.6*15.18)
    1.75*25/(1.6*15.18)
    4.2*700000
    5.47*100000=880*0.5*（x-20）+4.2*1000*2.5*（x-20）
    3.14(9.52-2*0.035)*100
    2*(25*18.75-1/4*3.14*9.82^2)*(1000/1.75)
    3.14*9.82(1.75-0.15)*(1000/1.75)

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