x^2<-1
    x^2≤0
    x^2<0
    -3/1＜＝x/1
    -x²＋4x-4＜0
    x^2-x-5>abs(2x-1)
    abs(x^2-2x-3)>2
    (2x+1)(x-3)>3(x^2+2)
    -3x^2+4x+4>0
    x-5/x+1<2
    (x-3)/(2-x)<0
    (x-3)/(2-x)>=0
    0<(1+x)(1-2/3x)<1
    [（k+0.5）4k-50]/（k+0.5）＞0
    -0.05<=(500x-0.02214-503.5088x+252.43405x^2)/(500x)<=0.05
    -0.05<=(500x-0.02214-503.5088+252.43405x^2)/(500x)<=0.05
    -0.05<=(500x-0.04441-502.1204x+251.5427x^2)/(500x)<=0.05
    -0.05<=(500x-0.01357-503.53533x+252.62243x^2)/(500x)<=0.05
    -0.05<=(500x-0.01357-503.53533x+252.62243x^2)/(500x)
    2t^2+11t+18<=0

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