-2x²+3x-4＜0
    x²-2√5x+√5＞0
    x²-2√5+√5＞0
    2x＾2+3x<0
    2x＾2-3x<0
    2x(x-1/2)小于1
    -x＾2+2x+3>=0
    x＾2-x+1>=0
    x＾2-x+1<=0
    1/36≥k²
    1/36≤k²
    1/4≤k²
    (-2-p-sqrt((2+p)＾2-4)/2<=0
    (-2-p+sqrt((2+p)＾2-4)/2<0
    (2+p)＾2-4<0
    （x^2-x）（x+2）＞（x^3-x）^2
    x（6x+5）＜4
    2m-1
    abs(x-1)>2
    x（x+1）（x+2）>[（x-1）x（x+1）]^2

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