2^a-a<1
    x*x+9x-400≤0
    e^a-a<1
    e^a-a≥1
    a^2+e^a+2^a+a≥-125
    cosx（x+1）＞1
    tanx＞x
    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

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