9(a-2)-6(a+3)+4a<0
    （X＋1）^(2)－4×（2x－1）×（x－4）>=0
    -857+x-x×8%/4≥10
    x^(2)-2x-3>0
    0.225*x>(ln(1+x))
    0.225>x*(ln(1+(1/x)))
    (1/x+2x)^4
    ln(1+2d)<1/1.8
    x*(ln(1+(1/x)))<1/3.6
    0.5x^3-5.5x^2+14x-90>0
    (1562.45+x＋√(1562.45x))×7.13÷3=3225.873
    2√(x+3）+2√3-2≤x+1
    -b/2
    b+3<-b/2
    b<-b/2
    b<-b/2<>
    x^(2)-x-1≥0
    4x^(2)-4x+15>0
    3x-7≥8-2x+7
    (2x-3)-3>(-3x-2)^(2)

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