x^2+3x-1>=0
    -x^2+6x-10>0
    -4x^2+18x-81/4<=0
    (x-2)(1-3x)>2
    x^2-2x+2>0
    (2k+1）^2－4(k^2－1）≥0
    x^2-8x+16<=0
    x^2-2x+2>0
    -3x^2+6x-2>0
    2x^2-3x-2>0
    x^2-x+2<0
    2x^2-3x-2＜0
    x^2-6x=9<=0
    -x^2+4x<=0
    abs(r-5)
    abs(r-5)
    abs(x)>-1
    x^2>-1
    2x^2>19
    2x>3

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