x^2-x-6<=0 x^2+2x-8>0
    x^2-x-6<=0 x^2+2x-8
    x^2-4x+3
    (2x+3)(3x－1)＜0
    abs(x+1)-abs(x-2)>=x^3-2x^2-3
    abs(x+1)-abs(x-2)>=2
    9x^2-666x+11025<0
    x<85
    x-64=24
    x+64=40
    -(x/2)-(((x^2-104)^0.5)/2)>0
    3000+20x-0.1x^2<25000x
    300+20x-0.1x^2<25000x
    8700-8700+x =x
    e^((-a*3.14)/(1-a^2)^0.5)=0.2
    1-x*x>x-1
    -9/60+h＞2.43
    -144/60+h≤0
    x^2-3.949x+7.25>0
    280x-x×x=2700

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