(12-sqrt(13))/13
    sqrt(sqrt(313)-5)
    50+50*(1-(1.08)^-19)/0.08
    50+50*(1-(1.08)^-19)/0.008
    50+50*(1-(1/(1.08)^19))/0.008
    20×10000
    21.28*42.5+20*3.5-(11.2*13.3*20*3.5)/604.75+60000/604.75*(1+(0.5*604.75)/2327.28)
    1.619*600^2*11.5+0.7371*0.005*600^2*280
    1.619×600^2×11.5+0.737 1×0.005×600^2×280
    [59.42*(6948.35*10^3)/(3.14*600^2*25)*(2.80*(6.438*46)/600-1.0)-1.65]*(0.005)^(-2/3)
     2*(0.4641*0.58916+0.75*0.75*arcsin(0.4641/0.75))
     2*(0.4641*0.58916+3.14/180*0.75*0.75*arcsin(0.4641/0.75))
    0.4641*(0.75*0.75-0.4641*0.4641)^1/2
    2*(0.4641*(0.75*0.75-0.4641*0.4641)^1/2+3.14/180*0.75*0.75*arcsin(0.4641/0.75)
    arcsin(0.4641/0.75)
    770124720-5000-1920498.05=
    614（1-14%）=
    1+1/(1400*0.0462/1.14)*(42.5/1.2 )^2*0.309*0.796
    6/9:3=
    sqrt-2

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