-850000+480000/1.15+430000/[(1.15)^2]+320000/[(1.15)^3]
    -975000+260000/1.15+350000/[(1.15)^2]+360000/[(1.15)^3]+400000/[(1.15)^4]+500000/[(1.15)^5]
    -650000+320000/1.15+320000/[(1.15)^2]+230000/[(1.15)^3]+175000/[(1.15)^4]+120000/[(1.15)^5]
    [260*(1.15)^4+350*(1.15)^3+360*(1.15)^2+400*1.15+500]/975
    320*(1.15)^4
    [320*(1.15)^4+320*(1.15)^3+230*(1.15)^2+175*1.15+120]/650
    e^8.476
    80÷118
    80/118
    6*14*8
    1294-1176
    196*6
    lg4/lg16
    41*41 51*51 61*61 71*71 81*81 91*91
    50*50 60*60 70*70 80*80 90*90
    5%5
    25*25 35*35 45*45 55*55 65*65
    6e2-31e+44
    (84.65*10^6)/(1-(1-84.65*10^6/(680*10^6))*(15.07/19.62)^2)
    (84.65*10^6)/(1-(1-84.65*10^6/(680*10^6))*(15.07/15.7)^2)

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