√(-4/x)＜1
    √(-4/x)＞1
    3(5-x)<-75
    -x>1
    -x^2+5x<0
    -6x≤-7
    16k*k+12-24k*k>0
    2-27x大于等于2.43
    10x<1
    （x-1）/（3-x）>0
    6÷m＞-2
    2^（-x）<2
    4-4(a-2)>0
    0<=(k*k)<2
    0<=k2<2
    45x>x＾2
    4x²－5x+1≥0
    -6x^2+13x-6>0
    sinx≤-1/2
    -3x²-4x-4＜0

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