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
    x^2+26=sqrt(2x^2-20*x+67)+10*x
    x*ln(x)-(x-1)*ln(x-1)=ln2/2
    4 X2-70x+124=0

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