2*x^2-1<=-x
    2-x＞ln4-lnx-lnx
    2-x-2(ln2/x)＞0
    cosx≥-1/2
    3x＜6
    x＋1／x＞20
    x-x／1＞10
    x+x＾5＜666
    x＾3-6＞2
    2a-1+1/2a-1+1＞3-4a+1/3-4a+1
    2000+(500/(1+r))>-6800+(10000/(1+r))
    -8000+（12000/（1+r））>300+(600/(1+r))
    ex＜0
    ex≤0
    97.89*0.8+x*0.2>=96.5 98.16*0.8+x*0.2>=96.5 98.83*0.8+x*0.2>=96.5
    97.89*0.8+x*0.2>=97
    (x-1)(x+2)<0
    (x-1)(x-2)<0
    （x－12）/x≥0.97
    （x-6）/（x+6）≥0.97

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