x+13.57√x^2≥198.1
    x+13.57x^2/3≥43.2
    x+13.57x^2/3≥198.1
    57x^2/3≥198.1
     ( 4-2m )/( m+5 ) ＜0
    ( m-3 )/( m+5 ) ＞0
    x-3＞2
    -（3/5x）＞1-【3/（27-4x）】
    -（5x/3）＞1-(27/3-4x)
    -5x/3＞1-27/3-4x
    {20x-30（100-x）≤2800 40x-20（100-x）≤2800
    x^2-9≥=0
    9-x^2≥=0
    x^2-9>=0
    x^2≥0
    x^4+2x^3+5x^2+4x-4>0
    x^2-2x-3>0
    121-x^2>=0
    sin(x)>0
    cos(x)>0

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