x>0,(x^2-x+1)/x
    x>0,x^2-x+1
    x^2-x+1>0
    5a<0
    √ x ^ 2 - x - 12 >=0
    (x-1)(√x^2-x-12)>=0
    0
    -2
    x^4-2x^3-3x^2<0
    5x − 1/x + 2≤ 8
    50<2^(x-1)
    (2x − 7)(9x + 9) ≤ 0
    x/2+4<=1
    2(x-3)-3(x-2)>-6
    x/2-x/3>-1
     x/2-x/3>-1
     x+8<4x-1
     2x-1>x+1
     2x-2>x+1
    （x-2)/2>x/3

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