x^4-x-2>0
    -1/2x^2+3x-5>0
    （1-x）/（2+x）≥1
    2<1-b+sqrt(b^2-2*b-7)<4
    -4x+x-x^2<0
    x^2-6x+9≤0
    4x^2+4x+1>0
    x-x^2+6<0
    x-x^2+6<0>
    3x^2+5x-2=0
    m^(2)－5/2<2m－1－5/2
    x^(2)－3x－4≥0
    x^(2)－9x＋14≤0
    x^(2)－7x＋6≥0
    3x^(2)－x<0
    x^(2)－12x＋20<0
    －x^(2)＋2x－3>0
    x^(2)－5x＋6>0
    9x^(2)－6x＋1>0
    （x+7)（x-6)<0

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