-(2k-2)/sqrt(1+k^2)<1
    (2k-2)/sqrt(1+k^2)<1
    0.2x^2-2x+0.2×6＜0
    (x^2)-6x+8<0
    x^2+2x+2>=0
    x^2+2x+5>=0
    （1000-x）【10（1+0.2x%）】≥10000
    x^2+5000x-24000000<0
    23994000+998x+x^2<0
    x^2-3*x+4>0
    a^2-6a-3<0
    31－N＜2N
    【13（1+0.7x）-10(1+x)】*5000(1+0.4x)>15000
    2x^2-5x+3大于0
    x^2-x-1/x+1/x^2小于等于0
    3/（2-x）小于x
    3/2-x小于x
    x^2-3x+6大于等于10
    -2x2+x＜-4
    x^2<-5000+15x

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