3x^3-x^2-2≥0
    20x^2－5x－4＜0
    6x^2-49x+30<0
    54x^3+54x^2-63x+2>0
    4.5*10000/(1+4.5*10000*x)>=5*10000/(1+5*10000*x)*0.999
    x+5<7 x-6>3
    x+5<7
    2000-50n≥2.085√n
    -m^2+5m≤6
    -2x^2+3x+2>0
    abs(x+2)>abs(2x^2+3x-2)
    3x+28≥-x^2
    -4082750+3000000+x-45000-x*0.1/4>300000
    xx+5x+4>0
    xx-2x-3<0
    x+1<0
    （51*x）/(51+x)^2>0.65
    1/2<=1/x<=2
    （118-x）/10＞ln（50/（x-68））
    x^2+4899x+2500＜0

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