（1.01+1.88x）*55+2490x=223.86
    x(x-1)/2=45
    x/72+0.35x/72+0.35x*1.4/36=50
    x²+5x-2250=
    x(35-x)=640
    12=（44+x)/24+0.4x/18
    12=（44+x)/24+(1.4x*1.4)/18
    12=（44+x)/24+(x-0.4x*1.4)/18
    12=（44+x)/24+(0.4x*1.4)/18
    -0.5x^2+35x=640
    x²-12x+28=0
    x(30-2x)=100
    X(33-x)+20x
    x=6*1.1283/ln11
    x*ln(x)-(x-1)ln(x-1)=ln11/6
    x=6/ln(11)
    x*ln(x)-(x-1)ln(x-1)=6/ln(11)
    x*ln(x)-(x-1)ln(x-1)=6/ln11
    x(33一x)+20x=150
    x=2*1.104828/ln2

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