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    (1.51%-0.82%+0.98%-1.76%+1.04%-2.41%+(-0.81%)-(-0.92%)+1.31%-0.88%+2.88%-1.91%)/3=
    80/(1+6.5%/2)+80/(1+6.5%/2)^2+(50%×1906.545881+50%×2730.457848)/1+(6.5%/2)^2=
    15.684*0.00628/1.148
    (0.00628/1.148)*[(789.671/3.21)^1/2]
    (0.00628/1.148)*(789.671/3.21)^1/2
    (80/2.5%)×(1-1/(1+2.5%)^38)+(2000/(1+2.5%)^38)=
    (80/2.5%)×(1-1/(1+2.5%)^38)+(20000/(1+2.5%)^38)=
    (9/1.1)+(39/(1.1^2))+(56+970.67)/(1.1^3)
    (80/4.25%)×(1-1/(1+4.25%)^38)+(2000/(1+4.25%)^38)=
    56*1.04/6%
    arctan4.32-arctan(4.32/2)
    (27/110)*(1-28%)*6+(23/110)*10+(60/110)*19
    (43000-32000-4000)*70%+4000
    0.12+0.04*0.2795*0.7=
    0.13+0.05*0.57*0.7=
    42.5/1.035+42.5/(1.035)^2+(0.5*1052.987578+0.5*1315.833551)/(1.035)^2=
    42.5/1.035+42.5/(1.035)^2+(0.5*1052.987578+065*1315.833551)/(1.035)^2=
    42.5/(1+7%/2)+42.5/(1+7%/2)^2+(50%*((42.5/4%)*(1-1/(1+4%)^48)+10000/(1+4%)^48)+50%*((42.5/3%)*(1-1/(1+3%)^48)+10000/(1+3%)^48))/(1+7%/2)^2=
    42.5/(1+7%/2)+42.5/(1+7%/2)^2+(50%*1052.987578+50%*1315.833551)*(1+7%/2)^2=
    42.5/3%*(1-1/(1+3%)^48)+1000/(1+3%)^48=

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