90-arctan(0.2*x)-arctan(x)=46
    5/x*sqrt(1+0.04x^2)*sqrt(1+x^2)=1/sqrt(5.8)
    20lg(5/x*sqrt(1+0.04x^2)*sqrt(1+x^2))=-10lg5.8
    x*sqrt(1+0.04x^2)*sqrt(1+x^2)=5
    x*sqrt(1+(0.2x)^2)*sqrt(1+x^2)=1
    x*sqrt(1+0.04x^2)*sqrt(1+x^2)=1
    31.6=x*sqrt(1+(x/31.6)^2)
    20(sqrt(1+(0.25x)^2))/(x*sqrt(1+(0.5x)^2)*sqrt(1+(0.04x)^2))=1
    20/(x*sqrt(1+(0.5x)^2))=1
    x=（1-x)（5-x）^10
    20lgk=21
    x*sqrt(1+x^2)*sqrt(1+(x/50)^2)=20
    90-arctan(x)-arctan(x/50)=30
    -90-arctan(x)-arctan(x/50)=-180
    90-arctan(x)-arctan(x/50)=-180
    （7-10x）(1-x)=x
    （5-10x）(1-x)=x
    19x×24=17x×30
    (X+300)*1.1=2299
    1.3*(X+300)=2299

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