30x+x^2-x÷2＜1200
    x^2>=1
    X2-X+6<0
    (2/3)abs(x)+1<(7/2)+(1/2)abs(x)
    (30x＋20x)－500－900＞(500＋900)×0.25
    4-x＞2
    （x－1）/2＞1－（2－5x）/3
    （7991+（X-15999）*46%）/X ≤50%
    7991+（X-15999）*46%/X ≤50%
    -32K^(2)+47K-16>0
    7991+（X-15999）*46%/X≤50%
    3x^2-9600x+1228800>0
    ((1/15)*x^3+10*x^2+12*x+3.6)/(0.6*x+40)>1169.5
    4x^2+6x>7
    10x-1>3x^2
    -3x^2-14x>9
    4x^2-21>-5x
    4x^2-42x+54>0
    -4x+12>5x^2
    12x^2>3x+15

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