(-2x+160)(x-30)> 800
    (-2x+160)(x-30)<800
    (1000-10n)/sqrt(n)＞1.96
    2x-2>3(x-1) (x/3)-((x-1)/2)<1
    x＋2＜2x
    2x－3≥1
    26<2x+1.5(15-x)<27
    x^2-70x+4500≤0
     6x≤(x^2+1)(2x-1)
    6x/x^2+1 ≤2x-1
    6x^2/x+1 ≤2x-1
    6x^2/x+1≤2x-1
    X-1/2＜x/3
    6x/x^2+1≤2x-1
    5x-3x-59<4
    3x+59<5(x-1)+3
    －x－3＜1
    2-3(7+2x)<5 (2x-1)/3-(5x+1)/2<=1
    ( 2 / 1 + x ) + ( 3 / 1 - x ) ≥1
    （2/1+x）+（3/1-x）＞1

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