x^2-4>0 x+3>10
    x(1-x)<0
    x^2/15.68+x<3.6x
    3.6x^2/15.68+3.6x
    3.6x^2/15.68+x
    x^2/15.68
    x^2/15.68+x
    -0.5＜-2x+1/3＜0.5
    -30x^2+1300x-5750＞0
    x^2+4x-12＜0
    x+6＜0
    (x^2+1)/(2×x)≤x/2-1
    (x^2+1)/(2×x)≤x/2+1
    (x^2+1)/2×x≤x/2+1
    1/2^x>x^1/2
    x^3+2x^2>3x
    e2+6e-7>=0
    e2<9
    x2<9
    x>9

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