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
    （20000-100y）^2+(y-200)^2=49
    X=X*0.06/1.06+X*0.06*0.11/1.06+X*0.0003+24000+4490.47
    20-X=9
    11*x*x+x-8
    11*x2+x-8
    566037.74-X/1.03-X/1.03*0.03*0.06=0
    600000/1.06-X/1.03-X/1.03*0.03*0.06=0
    10%x+8%*（1-x）=9.4%
    518867.92-X/1.03-X/1.03*0.03*0.06=0
    x²-8.9x+12.2=0
    x²-13.6x+46.2=0
    x×sinx

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