2^（2-t）＞=0.2
    2^（2-t）＞=0.2
    sinx/(1+x^2)＞1/2
    -1/2
    sinx/(1+x^2)<1/2>
    (x－2)(x－3)≥0
    a(3a+10)=<1
    (x-9)-(x+2)<-5
    1-1/x＞0
    e-1/x＞0
    2x＞sin2x
    x-1/x+4小于等于0
    2x^3-3x^2-4>0
    X+2>2X-3
    5X-1>3X+7
    X+2>2X-3
    2x-3（x-1）>2
    abs（2x^2-1）<1
    abs（2x^2-1）≤1
    abs（2x^2-1）<1

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