(2200*181^3)/3-((2200-180)*(181-120)^3)/3+6.667*4713*(1204-181)^2
    (1521.23^2+581950.79)^0.5-1521.23
    (2*6.667*4713*1204+120^2*(2200-180))/180
    3/8
    1*1.45*1*[169.22/(2*10^5)]*[(34.2+32.5)/(0.36+1.7*0.1)]
    1*1.45*1*[114.58/(2*10^5)]*[(34.2+32.5)/(0.36+1.7*0.1)]
    973.992*10^6/（0.87*1404*4712）
    1+0.5*867.012/973.992
    565.55*10^6/（0.87*1204*4712）
    686.64+0.4*356.60+0.4*94.33
    577.02/(0.25*0.2)
    5.4*1000*11^2
    (0.25*0.2)/(2*0.005*(0.25+0.2) )
    1+0.5*507.97/565.55
    686.64+0.7*356.60+0.4*94.33
    577.02/(0.2*0.2)
    5.4*1000*10^2
    (0.2*0.2)/(2*0.005*(0.2+0.2) )
    (0.15*0.2)/(2*0.005*(0.15+0.2) )
    413.10+0.4*191.95+0.4*45.22

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