100*sqrt(1+(0.13x)^2)/(x*sqrt(25+x^2)*sqrt(1+(0.1x)^2))=1
    100*sqrt(1+(0.126x)^2)/(x*sqrt(25+x^2)*sqrt(1+(0.055x)^2))=1
    100/(x*sqrt(25+x^2))=1/(sqrt(2.3))
    100*sqrt(1+(0.13x)^2)/(x*sqrt(25+x^2)*sqrt(1+(0.06x)^2))=1
    100/(x*sqrt(1+x^2))=1/(sqrt(2.2))
    100=x*sqrt(25+x^2)
    6x^2-1340x+52000=900
    x^2/((1-x)*5.4)=16/9
    x^2/((1-x)*5.4)=9/16
    x^2-13.8 x+42.8=0
    x^4-6x^3+14x^2-6x+4=0
    2（x-1)²-5=0
    x/(x-9)=4
    x^2-9.6x+11.5=0,x
    100sqrt(1+x^2)/(x*sqrt(1+(x/0.1)^2)*sqrt(1+(x/50)^2))=1
    100sqrt(1+x^2)/(x*sqrt(1+(x/0.1)^2)*sqrt(1+(x/50)^2))
    100sqrt(1+x^2)/(x*sqrt(1+100x^2)*sqrt(1+(x/50)^2))
    84.5*(1-r^11)/(1-r)-84.5=2246.714
    x2-3x-1=0
    72x=160

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