4*x^2/（1-sqrt（1+2*x））^2<2x+9
    （x^2+x-2)/2>2002
    (x*(x+1))/2<=2009
    X-X*0.02=744631203.81
    abs(x-1)<1
    abs(x-1)<5
    12+(6*2+8*2+12*2+2X)
    12+(6*2+8*2+12*2+3X)
    12+(6*2+8*2+12*2+4X)
    2(X+2+2+2)=12+(6*2+8*2+12*2+4X)
    54000-5.7967x=
    54000-5.7967x =
    -2m-1>0
    m*m-m-1>0
    863.5-1.5x<575.5-x+175
    565.5-1.5x<377-x+175
    1131-1.5x<751-x+175
    1044-1.5x<765.6-x
     x/(x+1212396086) >= 25%
    868.5-1.5x<1852.8-x

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