(20/1.05+20/1.05^2+20/1.05^3)
    (20/1.05+40/1.05^2+1020/1.05^3)
    (50/1.15+100/1.15^2+1020*3/1.15^3)/703.182
    (50/1.15+100/1.15^2+150*3/1.15^3+4*1050/1.15^4)/714.502
    (50/1.05+100/1.05^2+150*3/1.05^3+4*1050/1.05^4)/1000
    (20/1.05+40/1.05^2+1020*3/1.05^3)/918.303
    ln0.00413
    ln0.015
    ln0.0065=
    (1*50/1.1+2*50/1.1^2+3*50/1.1^3+4*1050/1.1^4)/841.507
    （1*20/1.1+2*20/1.1^2+3*1020/1.1^3）/801.052
    (20/1.1+40/1.1^2+60/1.1^3)/801.052
    (50/1.1+100/1.1^2+150/1.1^3+200/1.1^4)/841.507
    (20/1.1+40/1.1^2+60/1.1^3)/801.051
    50/1.15+50/1.15^2+50/1.15^3+1050/1.15^4
    50/1.05+50/1.05^2+50/1.05^3+1050/1.05^4
    50/1.1+50/1.1^2+50/1.1^3 +1050/1.1^4
    0.1949×0.19951995 - 0.1995×0.19491949
    20/1.15+20/1.15^2+1020/1.15^3
    20/1.05+20/1.05^2+1020/1.05^3

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