x^2-10x+21>0
    4x^2-16x+7≤0
    1/3<(9xx－9x+2)/(9xx-1)<2/3
    4x^(2)十29x－24=0
    X^(2)－4X一3=0
    x^(2)十2X十1=0
    X^(2)一2X一3=0
    （x+1）（x－1）=0
    4x^(2)-24x+144>0
    -11a^2+2a+13<0
    （1+2x）/3>x-1
    1+2x/3>x-1
    2(x－1)>-2
    2(x－1)>-1
    (x－1)/2>-1
    (x－1)/2>1
    x－1/2>1
    2(x－1)＋1
    x-7<4
    (x+1)/6>=(2x-5)/4+1

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