x*(1-lnx)-2.55-0.924x>0
    x*(1-lnx)-2.55-0.924>0
    (1/3)x^2-(4/3)>x-1
    （5x-1）（5x+1）＞5
    （5x-1）（5x+1）＞2
    sqrt（5x）＞2
    sqrt（5x）＞1
    n（n-1）＞0
     (2*k+1)^2-4*(k^2-3) >0
    -(2*k+1)^2-4*(k^2-3)>0
    -(2*k+1)-4*(k^2-3)>0
     −1<(9a+13)/5≤8
     −1<(9a+135)/5≤8
    −1<9a+135≤8
    6(3x−2)+15≥9−(2x+19)
    x*x<2*x*(1-x)
    3-2x-x^2≥0
    (x-1)*1.8+x*682.34<=3830
    (x-1)*1.8+x*1211.54<=8680
    x^2-x≥-8/9

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