2a-a+3>0
    4a-a-8>0
    4a-a>8
    4a-a+8<0
    4a-a+8>0
    4a>a+8
    2a>a+3
    118a+76(20-a)≤1910
    3x+4[x]=16
    20-a≤2a
    1+a≥lna
    a2+4a+2=7
    1/x<1
    （3x+1）/2－1≥x
    2x－1>5
    （x－1）/3≤（x+1）/9
    4x>2x－6
    （3x－2）/5≥（2x+1）/3－1
    （3x－2）/5≥（2x1）/3－1
    （3x－2）/5≥（2x－1）/3－1

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