1÷2x-1≤-1
    1÷4-x≥-2
    12x^2-25x+12≤0
    -3x^2+2x-5≥0
    -3x^2+4x-1≤0
    4x^2-4x+1≤0
    abs(1-2x)≤5
    abs(2x-3)≥6
    -1≤1÷x≤1
    -1≤1≤
    -abs(4-3x)≤5
    -abs(3x-3)≥-7
    abs(4x-3)≤-2
    （x－3）（x－6）（x－4）（－x－2）
    x－4/x－1≥－x
    168+16(x-1)<85+25(x-1)
    168+16(x+1)<85+25(x+1)
    168+16x<85+25x
    168+16x>85+25x
    (k+13)^(2)+28(k+2)>0

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