2x^2-5x+2>0
    2x^-5x+2>0
    abs(2x-1）≤3
    x^2>1/6
    X（6X+5）＜4
    (4+k)(1-k)<0
    -16a²>4a
    k^2-3k+4<0
    3x2-10x+7>0
    x＾2-3x≤0
    x＾2-4x+3<0
    ln（x-3）≤2
    2x-5>9
    2x＾2-2x-1<0
    2x/（x-1）＜1
    2x＾2-x-1＞0
    6x>0
    2x-(x+6)≥3x+2(x-1)
    1/(1+3x^4)^2+x^3/12^(1/4)>3^(1/4)
    -1≤x²-x-1≤1

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