2a^3+3a^2-1<0
    2x=34x
    2a^3-3a^2+1>0
    x*ex/(x^2-1)>1
    (x+3)/(2x-1)<=2 (x+3)/(1-2x)<=2
    (x+3)/(1-2x)<=2
    (x+3)/(2x-1)<2
    -x^2+4x+30>0
    x^2-4x-30>0
    -5t^2+30t-21＞0
    2.6*100000*Q*Q+2.4*100000*Q*Q=20.9
    5/x+1<=3
    2^x(1+xln2)+x<0
    2<>3
    -（x+1）^0.5-9>0
    -（x+1）^1/2-9>0
    abs((1+2*x)^(1/4)-(1+0.5*x))<0.1
    2>a^3
    4
    m-1>3m-2

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