(0.078818-0.0768)/(12-1)/0.078818-2*0.002
    (0.099-0.0768)/(12-1)/0.099-2*0.002
    [(0.099/0.0768)/(20-1)/0.099-2*0.002
    [(0.099/0.0768)1/(20-1)-1]-2*0.002
    [(100*5)1/(20-1)-1]-2*0.002
    3.5*sqrt(2)=
    -500000+230000/(1+10%)+230000/(1+10%)^2+230000/（1+10%）^3+230000/（1+10%）^4+230000/（1+10%）^5
    -150000+120000/(1+10%)+110000/(1+10%)^2+95000/（1+10%）^3+80000/（1+10%）^4
    -200000+250000/(1+10%)+280000/(1+10%)^2+200000/（1+10%）^3
    (7.22%-16.1%)^2*0.6+(7.22%-1.3%)^2*0.4
    16.1%*0.4+1.3%*0.6
    0.03*30%+0.12*30%-0.08*40%
    0.18*30%+0.05*30%+0.23*40%
    (0.18*30%+0.05*30%+0.23*40%)*0.4+(0.03*30%+0.12*30%-0.08*40%)*0.6=
    4.41%*30/89+16.22%*4/89+9.65%*55/89=
    5.5*20+2.75*40=
    4e
    e3*e(-3)
    e3*e(1/3)
    4*(2^((-1)/3)+1)*((2^((-1)/3))^2-2^((-1)/3)+1)

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