0.005482=(（2.07*1000）/（4*3.1415926*x^2）)*(ln(x/6.831))
    0.0228=(（2.07*1000）/（4*3.1415926*x^2）)*(ln(x/91.33))
    0.005482=(（2.07*1000）/（4*3.1415926*x^2）)*(ln(x/68.31))
    -x/（1+x^2）=0.5
    0.005482=(（2.07*1000）/（4*3.1415926*x^2）)*(ln(x/6.831))
    0.0228=(（2.07*1000）/（4*3.1415926*x^2）)*(ln(x/9.133))
    -x/（1+x^2）=0.3
    0.0228=(（2.07*1000）/（4*3.1415926*x^2）)*(ln(x/91.33))
    0.0228=(（2.07*1000）/（4*3.1415926*x^2）)*(ln(x/91.33))
    0.0228=(（2.07*1000）/（4*3.1415926*x^2）)*(ln(x/9.133))
    0.00228=(（2.07*1000）/（4*3.1415926*x^2）)*(ln(x/9.133))
    0.00228=(（2.07*1000）/（4*3.1415926*x^2）)*(ln(x/91.33))
    -x/(1+x^2)=0.2
    0.005482=(（2.07*1000）/（4*3.1415926*x^2）)*(ln(x/68.31))
    0.005482=(（2.07*1000）/（4*3.1415926*x^2）)*(ln(x/68.31))
    0.005482=(（2.07*1000）/（4*3.1415926*x^2）)*(ln(x/68.31))
    0.005482=(（2.07*1000）/（4*3.1415926*x^2）)*(ln(x/6.831))
    0.005482=(（2.07*1000）/（4*3.1415926*x^2）)*(ln(x/6.831))
    -x+2=0
    3x-4=0

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