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
    2x>2x
    cosx-sinx>0
    −1excos(x)−1exsin(x)>0
    x^(-2)+x^(-1)>2
    abs(r-5)
    sqrt（10）
    2290-30(x-11)≥2200

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