7.107345*0.001*0.9^4.7475/（18（1+2.5*0.1+10.25*0.01））
    186.92*10^6/0.96/1431111.11/215
    1.07-(0.282/2.53)
    7..107345*0.001*0.95^4.7475/（18（1+2.5*0.05+10.25*0.05^2））
    1.8421*4320/(247.29)^2*10200*450/1431111.11*[1+(247.29*18/4.4/450)^2]
    7159*18/150/450
    112.33^2+107.32^2-112.33*107.32+3*(23.78^2)
    100000×(1+20%)^20
    1.1*259.75*10^3/(11.5*(74+5*(13.5+18)))
    100000×（1+20%）^20
    151.02*10^3*(150*18*(450/2-18/2))/322000000/11.5
    186.92*10^6*(450/2-18-13.5)/322000000
    259.75*10^3/11.5/231.5
    21.04*10^3/11.5/231.5
    74+5*(18+13.5)
    sqrt((1.442^2-1)*0.001^2+2*0.442*0.08*0.001)
    sqrt((1.442^2-1)*0.001^2+2*(1.442-1)*0.08*0.001)
    4.95^1.85
    4^1.85
    3^1.85

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