-2100000+1500000/（1+0.15）+750000/（1+0.15）^2+600000/(1+0.15)^3
    -850000+480000/（1+0.15）+430000/（1+0.15）^2+320000/(1+0.15)^3
    2.4*25*0.94*0.58
    √(0.85*0.84/0.8)
    2.4*25*0.67*0.58
     2.4*25*0.67*0.58
    24*25*0.67*0.58
     √2.65/2.8
     √(0.85*0.84/0.8)*0.71
    √（0.86*0.84/0.8）*0.71
    0.768948*6
    （√0.62475）*√（2.65/2.8）
    （0.85*0.84/0.8）*0.7
    2.91/1.082+53.17/1.082
    2/1.1+32/1.1
     2.84/(1+8.2%) + (2.91+53.17)/(1+8.2%)^2
     2.34/(1+10%) + (2.59+26)/(1+10%)^2
    70.3*((1-(1+6.83%)^-30)/6.83%)+1000/(1+6.83%)^30
    70.3*((1-(1+6.49%)^-30)/6.49%)+1000/(1+6.49%)^30
    71.10*((1-(1+6.81%)^-30)/6.81%)+1000/(1+6.81%)^30

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