-3x<-6
    4+4*3a大于0
    3/2x-1＞x-1
    90z-10(16-5z)<=1100
    30z-10(16-z)<=1100
    4t^3-3t+1>0
    x-5＞3
    20000-80a-（15600-240a）≤4800
    120-x≤2/3x
    120-x＞1/4x
    10000/x + 10000/(x+28.75) < 149
    10000/x + 10000/(x+28.75) < 147
    4.459x-3.217>=50
    (2x-1)/2<1 5x+2>=3x
    5a＾2-29a+40≦0
    5a＾2-27a+39≦0
    2/3(x)-(3x-1)/2<=1/3
    sinx+sin（9x）＞2
    sinx+sin9x＞2
    3x+2小于-7x+12

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