(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
    20/1.1+20/1.1^2+1020/1.1^3
    430/0.235-(12.12+30+15)/14.87-(60/1000*13+11/0.235)
    142.748918-158.495272
    (50/1.15)+(50/1.15^2)+(50/1.15^3)+(50/1.15^4)
    177.297526-158.495272
    (50/1.05)+(50/1.05^2)+(50/1.05^3)+(50/1.05^4)
    (50/1.1)+(50/1.1^2)+(50/1.1^3)+(50/1.1^4)
    49.73704-45.664502
    (20/1.15)+(20/1.15^2)+(20/1.15^3)
    54.464961-49.73704
    (20/1.05)+(20/1.05^2)+(20/1.05^3)
    （20/1.1）+（20/1.1^2）+(20/1.1^3)

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