59270000*ln(15.91891892*x)=1044*x
    59270000*ln(0.326086957*x)=1044*x
    59270000*ln(0.207792208*x)=1044*x
    59270000*ln(0.128571429*x)=1044*x
    59270000*ln(0.128571429 *x)=1044*x
    （150-140）/（1.11-x）=(140-100)/(x-1.23)
    x^4-x^2=72
    【20833x+4583(12-x)+20000x+1700(12-x)】*10.5+(21000+5000x+2000x)=2000000
    59270000*ln(0.129032258*x)=1044*x
    3x^2-28x-68
    3x^2-28x+49
    x+4.78/(x^2)=17.02
    120*120=(2*100^2-2*100^2*cos(x)
    1-(k+6/k-3)=(k+6/k+1)-1
    (k-3)(k+1)-(k+6)(k+1)=(k-6)(k-3)-(k-3)(k+1)
    50.85=(1-(1+x)^-60)/x
    0.90359/(x^2)+x=20
    x(x+1)=35.75
    （k＾2+5）÷(k＾2+1)
    x*0.6=30

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