80/1000*3600*3.7=55.5/1000000*x+0.5/1000000*1.5*(2*365*24*3600-x*3/1000)
    x+4+20+15%x+（x+15%x）*13%=2600
    11x-5.2=2.51x/（1+1.51x）
    16.61x^2+0.638x-5.2=0
    -2^(-7.85+11) = (x-100)*ln2
     -2^(m+11) = (m-4.93) * ln2
    x^2=18-(0.5/x)^2
    x^3-6x^2+8x-1=0
    x^2-160x+2025=0
    x^2-80x+2025=0
    12（x^2-1）=0
    1+x^2=x^4
    x^2-100x+2025=0
    x^2-400x+2025=0
    x+62-(68-x)=64
    x+x-6=64
    x^3-5x^2+6x-1=0
    62-(68-x)=x
    62-(68-x)=x
    x^2+2x+1

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