（X+15）/(X+100)=0.35
    K=741.5+14.83+0.01K+16.71+0.0002K+38.65+0.0005K+0.0529K
    K=741.5+14.83+0.01K+16.71+0.0002K+38.65+0.0005K+0.0538K
    X/87-30/1900-0.04-2/45-2/44.7=0.002（X+74）
    x^2-30*x-18000=0
    （3-x）（3+x）
    x^3-10x^2-4x+4
    x-0.967x/1.09*0.09=264.23
    6+x=25
    12.25*(1+81x^2)=x^2*(1+0.01x^2)*(1+x^2)*(1+100x^2)
    atan(9x)-atan(0.1x)-atanx-atan(10x)=-90
    0.115*(1.0625+0.00029x)*(1250-x)=0.345*(0.3195+0.00013x)*(x-150)
    0.115*(1.0625+0.00029x)*(1250-x)=0.345*(0.3195+0.00013x)*(150-x)
    x^4+2x^3+3x^2+2x+1=0
    1+(x-lnx)^2=x*(x-lnx)
    1-xln(x)+(lnx)^2
    1-x*ln(x)+(lnx)^2
    1-x*ln(x)+(ln(x))^2
    (1-x)(0.85*49x-36+36x)=36-36x
    (1-x)=9

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