（X-2）/(3X+5) < 4
    A/250*lnA-(1-A)/250*ln(1-A)+0.01*A*(1-A)<0
     1 / (x2 + 2x + 9) <0
    abs(1/sqrt(1+(200*3.14*x)^2)-1)<0.05
    2x-x＾2≥-1
    3x＾2-2x-1<0
    9k^2+10k +1<0
    9k^2+10k <1
    (3x+4)/(x-2)≥4
    (2x-1)/(x+1)≤1
    17>x^2>15
    （500+318×n）/(n+1)<338
    10+x≤2^x
    （1+ x）/(1-x)>0
    -20.5*k-0.5*k*k*(-41.5*k*k+2021.5*k-13120)>0
    8-k+4k^2＞0
    e^sint-cost-1<0
    12t-4.9t^2>2
    x+1/3x-2≥2
    abs（（1-x）/（2x+1））＞1

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