2%=x/（1.2+x）*100%
    x*0.3*0.12=323
    arctan(30/2)+arctan(30/6)-arctan(30/12)-arctan(30/60)-arctan(30/80)
    arctan(80/2)+arctan(80/6)-arctan(80/12)-arctan(80/60)-arctan(80/80)
    arctan(60/2)+arctan(60/6)-arctan(60/12)-arctan(60/60)-arctan(60/80)
    arctan(20/2)+arctan(20/6)-arctan(20/12)-arctan(20/60)-arctan(20/80)
    arctan(12/2)+arctan(12/6)-arctan(12/12)-arctan(12/60)-arctan(12/80)
    arctan(6/2)+arctan(6/6)-arctan(6/12)-arctan(6/60)-arctan(6/80)
    arctan(2/2)+arctan(2/6)-arctan(2/12)-arctan(2/60)-arctan(2/80)
    -π+arctan(2/2)+arctan(2/6)-arctan(2/12)-arctan(2/60)-arctan(2/80)=
    4.875+0.17832
    4.875+0.08329
    28660/2
    8530-4120
    17060/2
    1-e^(-(0.0560+0.0147))
    1*e
    e
    9.75+0.08329
    9.75+0.17832

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