4a≥9a^2-72a-144
    1+1/x大于0
    1÷2×x－ln（x＋1）＞0
    6x+8>7x+4
    x+6<8
    x^2-x-6<0
    x^2-x-6<6
    x/(x-2)>0
    30<6x+7<32
    －1≤2x－1≤1
    x+0.24x>100
    4(a-4)+2(2-3a)+30>0
    (3a-2)/(2a-8)<=1
    a-4+2-3a+30>0
    -(2-3a)/(2a-8)>=2
    600z-32000-68000>=(32000+68000)*0.2
    5z+9*3z<1000
    x-3x+3>-1
    x<(x-0.15)(1.15-x)+2(x-0.15)^2
    x<2(x-0.15)^2+2(x-0.15)(1.15-x)

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