780*1.5-1.5*300<（390-300+175）*x
    780*1.5-1.5x<390-x+175
    1170-1.5x<780-x+175
    3000-1.5x<1000-x+175
    1170-1.5x<390-x+175
    sqrt（x^2-3*x+1）+ sqrt（2*x^2+2x*-5)< sqrt(3*x^2+7*x-11)+ sqrt(7-8*x)
    （x^2+x-2)/2<2002
    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

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