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    arctan8.2*0.249-arctan8.2-arctan0.82-arctan0.06*8.2
    arctan3.6
    (0.092+1.36*0.00435*1.052)/(0.126*1.318)
    0.092+1.36*0.00435*1.052/(0.126*1.318)
    (550000+365000)/(175000+150000/4)=
    (550000+365000)/(175000+150000/(26/12))=
    (550000+365000)/(175000+150000/2)=
    (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=
    (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

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