k^2>=8k
    x^2+12x+11＞0
    (20+2x)(40-x)>1500
    x^2+4x <0
    x^2-4x <-3
    x^2-4x<-3
    -x^2-4x+6>0
    2x^2-x>1
    x×x－x＋2＜0
    k^2+k+2<=8
    x^2-3x+2>0
    -5x^2-5x-4<0
    a^2+16a<0
    (5a-5)(25-a)>=0
    5*x*x-14*x-3≥0
    0.4xx-10x-8x+80<0
    0.64xx-18x+80<0
    xx+2*(2^0.5)x-30<0
    x^30+30*x^29*(1-x)+15*29*x^28*(1-x)^2+4060*x^27*(1-x)^3+27405*x^26*(1-x)^4+142506*x^25*(1-x)^5>0.9999
    x*x-2x<0

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