x>3 x<2
    x-4<(x-8)/3
    4(x+1)<7x+13
    ((x-1/2)^2+7/4)×(x+4)(x-3)≥0
    2a-3>a+1
    6x^2-5x-1<0
    x^2>4
    1245.4 * ( x +1 ) < x ^ 2 * ( 8 * x - 1 ) ^ 2
    1245.4 * ( x+0.57 ) < x ^ 2 * ( 8 * x - 1 ) ^ 2
    1245.4 * ( x+1.2 ) < x ^ 2 * ( 8 * x - 1 ) ^ 2
    1245.4 * ( x - 0.57 ) < x ^ 2 * ( 8 * x - 1 ) ^ 2
    1245.4 * ( x - 1 ) < x ^ 2 * ( 8 * x - 1 ) ^ 2
    1245.4(x-1.2)
    1245.4(x-1.2)<5
    2-2x^2>0
    2-2x^2>0
    -1/10x-90/x+8≥1.9
    -1/（10x）-90/x+8≥1.9
    -1/2*t*t-250t+30000>16610
    -t^2/2-250t+30000>16610

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