0.0228=(（2.07*1000）/（4*3.14*x^2）)*(ln(x/91.33)+0.5)
    -2*-x
    -3x+1
    3x-2
    0.0228=(（2.07*100000）/（4*3.14*x^2）)*(ln(x/91.33))
    0.0228=(（2.07*100000）/（4*3.14*x^2）)*(ln(x/91.33))
    0.0228=(（2.07*1000）/（4*3.14*x^2）)*(ln(x/91.33))
    3.95=(（2.07*10^5）/(4*3.1415926*X^2))*ln(X/91.33)
    0.0228=(（2.07*10^5）/(4*3.1415926*X^2))*ln(X/91.33)
    22.8=(（2.07*10^5）/(4*3.1415926*X^2))*ln(X/91.33)
    357.75:131.75=x+10%：x
    4.9x^2+340x-2176＝0
    （x+4）*（x+4）-x*x＝96
    3x^2+10x-8=0
    （2306.26+X）*6.11419%=（360/180）*X
    3x^2+10x-8=0
    -0.2652x＝ln0.35667
    -0.2652x＝ln0.35667x
    0.0228=(（2.07*10^5）/(4*3.1415926*X^2))*ln(X/91.33)
    0.0228=(（2.07*10^5）/(4*3.1415926*x^2))*ln(x/91.33)

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