-3≤2x-3＜5
    （x-3）（x+2）＞0
    40＜3c^2-3c
    9n/12n+6>7/44
    1/(x-1)+2/(x-2)>=1
    4（x-1）+3≥2x
    sin(π/6-2x)>2^(1/2)/2
    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

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