Mathematics
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    2a^2+a+1<0
    (160x/800)/(160x/800+0.5)>0.5
    (160x/80)/(160x/80+0.5)>0.5
    -3<(k-2)/k<3
    x^2>1/4
    (4*x+4)/(x-1)>0
    (-0.1-x)^2-x^2 >0
    (-1-x)^2-x^2 >0
     (-1-x)^2-x^2 <0
    (-1-x^2)^2-x^2<0
    x^2-x-10.1<0
    x^(2/3)-x^(-1/2)<0
    x^2/3-1/x^1/2<0
    3x-x^2大于等于-10
    2sinx-1>0
    x^2-24x+400<0
    4a∧2<4
    200-a<=a<=200
    (X-5)/2-(4X-3)/3<1
    3X+6<=5(X-1)

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