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
    －2x－5＞3（x－5）
    9x^3-21x^2+36x-32＜0
    (x-4)/(x+5) <=0
    (x-4)/(x+5)<0
    (3x^2+2x+2)/(x^2+x+1)＞3
    (3x^2+2x+2)/(x^2+x+1)＞0
    3x-2<5x+1

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