lgx≤2
    2-lgx≥0
    1≤2X-1<9
    3x-3/x
    1/(8*(1-x))≥1/4+x/9(1-x)
    2*（9+4x）*（1-x）≥9
    x^2+x+1＞0
    x^2-6x+9＞0
    x2-6x+9＞0
    X^（2/5）>=4
    X^2/5>=4
    x(x+1)(x-8)>0
    35-2x≤18
    0≤log(x^2+1,1)≤0
    0<1/(x^2+1)<2
    exeex＞4000
    ex≥0
    abssinx＞absx
    tanx＞x
    x-4<24-3x

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