(x+155.56^2/24*x)*0.04+77.78-155.56^3/240*x^2=77.78
    (x+70^2/24*x)*0.69+35-70^3/240*x^2=110.47
    （x+4900/24*x）*0.69+35-343000/240*x^2=110.47
    (8081231.455+1.1X)/(7788153.95-1.1X)=X/1908151.11
    (8081231.455+1.1X)/(7788153.95-1.1X)=X/1908151.11
    (8081231.455+1.1X)/(7788153.95-1.1X)=X/1908151.11
    x＾7-15x＾6+89x＾5-265x＾4+414x＾3-322x＾2+105x-9
    500000X-X*X=2
    50000x-x*x=2
    x＾5-9x＾4+28x＾3-35x＾2+15x-1
    (3x+2)²=16
    10lgX=-3
    10lgX=6
    (X+1)^3-6(X+1)-8=0
    4+x²=16+（8-x）²
    x+20÷3=80-x÷2
    x*(x-1)*(x^7-15*x^6+89*x^5-265*x^4+414*x^3-322*x^2+105*x-9)=0
    10(1-x^2/4)/x^3=-3.14/16
    3Y+Y/3=180
    3x^2+300x+5000=0

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