abs(2-3x)≥4
    abs(3x-2)≤6
    x^2-4x+4≤0
    x^2-4x+4
    14x^2-27x+9≥0
    x^2-3x+4≤0
    -2x^2+6x-8≥0
    1÷x≤1÷3
    1÷(2x+1)+1÷(4-2x)≤0
    x+2≥x
    3-2x÷2≤-1÷4
    x^2+2x-1>0
    8-3x^=-10
    3x^2+2x-5≥0
    （3-x)(x+2）>0
    （6-x）(x+2)≤0
    （2x+1）(x-1)>0
    （x-1）(x+2)≤0
    （x-2）(x-3)≤0
    -x^2+2x+3>0

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