X(1-X)^2>1/15
    800x-（200/1.4)x＞0
    800x-（200)x＞0
    800x-（200/20)x＞0
    800x-（200/16)x＞0
    800x-（200/5)x＞0
    800x-（200/14)x＞0
    （x-1）÷x≤0
    [p^956]*[(2-p)^514]*[(1-p)^50]≥e24.639
    [p^956]*[(2-p)^514]*[(1-p)^50]≥50185902624.879
    [p^956]*[(2-p)^514]*[(1-p)^50]≤50185902624.879
     848400 <14400 * x - 24 * x ^ 2 + (x * ( 600 - x ) / x ^ ( 1 / 2 ))
    848400 <14400 * x - 24 * x ^ 2 + x * ( 600 - x ) / x ^ (1 / 2)
    848400<14400x-24x^2+x(600-x)/x^1/2
    14400-24x^2+x(600-x)/x^1/2>848411
    (5x−21)/(x−9)≥2
    (5x+39)/(x+7)≤3
    x+4/x+15≤0
    x+4/x+15≥0
    10+5x＞6x-3-30

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