arctan(0.255w)-90-arctan(0.13w)-arctan(0.2w)-arctan(0.05w)=-180
    arctan(0.255w)-90-arctan(0.13w)-arctan(0.2w)-arctan(0.05w)=-180
    arctan(0.255w)-90-arctan(0.13w)-arctan(0.2w)-arctan(0.05w)=-180
    arctan 0.255w-90-arctan 0.13w-arctan 0.2w-arctan 0.05w=-180
    w×w×(1+0.2w×0.2w)×(1+0.05w×0.05w)＝36
     x*x(1+0.04x*x)(1+0.0025x*x) = 67.57
    x*x(1+0.04x*x)(1+0.0025x*x)=69.23
    x*x(1+0.04x*x)(1+0.0025x*x)=18.72
     x*x(1+0.04x*x)(1+0.0025x*x) = 46.5142
     x*x(1+0.04x*x)(1+0.0025x*x) = 57.61
    20lgK＝34
    x*x(1+1/49x*x)(1+0.04x*x)(1+0.0025x*x)=36(1+1/16x*x)
    x*x(1+1/49x*x)(1+0.04x*x(1+0.0025x*x)=36(1+1/16x*x)
    x*x(1+0.04x*x)(1+0.0025x*x)=7.59
    1380x²-1269600x+1.45×10∧7=0
    arctan1/4x-90-arctan1/7x-arctan0.2x-arctan0.05x=-180
    arctan1/4w-90-arctan1/7w-arctan0.2w-arctan0.05w=-180
    arctan0.2x+arctan0.05x=90
    arctan( 1/4x)-90-arctan (1/7x)-arctan(0.2x)-arctan (0.05x)=180
    x*x(1+0.04x*x)(1+0.0025x*x)=36

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