3.14*0.0625*0.0625*3150*1.2*0.2*（1/2170+0.0625/900/0.005）
    3.14*0.0625*0.0625*3150
    3.14*0.0625*0.0625*1000*3150
    3.14*0.175*0.175*1000*886
    1.2*3.14*0.175*0.175*1000*886*0.2*（1/2170+0.35/900/0.005）
    1.2*3.14*0.175*0.175*1000*886*0.2*（1/2170+0.35/900*0.005）
    1.2*3.14*0.175*0.175*1000*886*0.2
    5.522453/[-0.1996e^(0.38*5.522453)+5.0431]
    5.522453/[e^(0.38*5.522453)+5.0431]
    5.522453/e^(0.38*5.522453)+5.0431
    5.522453*e^(0.38*5.522453)+5.0431
    3635+（300*4.85）+（300*5.05）+（377*5.15）+200+150+300=
    0+1
    (4/15)/(-(2/5))
    7*-1/7
    7*-7
    -0.25*8
    -1/5*1/5
    15*1/3
    (-7)*(-6)

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