arctan0.373544
    200*4.725939*10/(0.2*50000)
    200*4.725939*10/(0.2*50)
    200*4.725939*10000000/(0.2*50000)
    200*4.725939*10000000/(0.2*50)
    11714.25+2000
    920+22.69+950+215.87+52+1840+48.17+28.5+950+191.67+16.2+920+103.52+992+58.52+172.75+21.5+472+597+991+9×50×2+7×50×2+533.61+17.25+15.25
    （180+50）×4+22.69+30
    （180+50）×4+215.87+10+30+12
    （180+50）×4=
    （180+50）×4+48.17+28.5+30
    （180+50）×4+191.67+16.2
    （180+50）×4+103.52+16+46+14
    （180+50）×4+58.52+172.75+9.5+2+10
    （180+50）×2+9+3
    （180+50）×2+14+108+15
    （230+50）×4+9×50×2+7×50×2+533.61+36+17.25+15.25+35
    3*(1+11.11%)/50+11.11%
    (8000*8%)/(10000*.98)
    ((1000*0.03)/(1100*.95)+1)^2-1

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