6-0.5b>2+0.5b
    1/x大于等于-1/3
    2abs(2x-1)≤2
    abs(2x－1)＜3
    2x－1＜3
    x^2-x+1>=0
    x^2-x+1>0
    x^2-x-1>0
    x^2-x-1>0 x>=1
    x^2-2x-1>0
    x^2-x+1>0
    4*x+3+1/(2*x)＞-2
    x+2+1/(2*x)＞-2
    4*x+3+1/(2*x)＜2
    x+2+1/2*x＞-2
    x+2+1/2*x＜2
    18+x<=40+45
    （2-x）^2>16
    4-x＾2>16
    4-x2>16

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