X^2-3X-4＞0
    n^3>(n+1)^2
    -4x^2-36x+56＞0
    45<6x
    1/0.4=1/0.95/x
    2x+3>-1
    3x-4≥1
    3x一4≥1
    3-4≥1
    (x-1)/2<(3-2x)/6 (2x+1)/3>-(x-1)/4
    (x-1)/2<(3-2x)/6 (2x+1)/3>(x-1)/-4
    -3x-2>=7 x+1>=-3
    -3x-2>=7 (1) x+1>=-3 (2)
    -3x-2>=7 x+1>=-3
    2(x+1)>=3(2x+1)
    0.1990x2=0.0398
    2x^2-3x+1<0>
    abs(x-5)-abs(2x-3)<1
    105*t^(1/2)-35/4*t^(3/2)＞0
    (x-399)/x>0.4

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