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
    n^2-20n-4>0
    900/(y)^2-108000/y＞-4107793.367
    3x^3+2x^2+13x+6>0
    x^4+x^3-2x+3<0
    x^4-x^3-2x+3<0
    x^3-3x^2-24x>28
    a^2-16a+4＜0
    x^3+5x^2+2x-8>0
    2x^2+7x-4>0
    x^2-40x+160<=0
    x^2+x+1>=0
    4*y*y-2*y-(7/2)>=0
    (-2+0.5*y)^2-(15/4)*(-y*y+2)>=0

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