x(1-x^18)/(1-x)=205.0387141
    x(1-x^18)/(1-x)=325.3372569
    x(1-x^18)/(1-x)=345.2028945
    x(1-x^18)/(1-x)=409.264122
    x(1-x^18)/(1-x)=255.4531572
    x(1-x^18)/(1-x)=783.184341
    x(1-x^18)/(1-x)=155.2481788
    x(1-x^18)/(1-x)=244.313025
    4*x^2=9
    x+lnx=ln（100000000／6.28）
    x(1-x^18)/(1-x)=94.4933895
    4*x^29=9
    x(1-x^18)/(1-x)=535.2976537
    x(1-x^18)/(1-x)=374.0369555
    4x^2-9=0
    x(1-x^18)/(1-x)=90.11689711
    x(1-x^18)/(1-x)=152.3669717
    x(1-x^18)/(1-x)=443.9321058
    x(1-x^18)/(1-x)=122.3391304
    x(1-x^18)/(1-x)=1398.307766

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