3x2-12≤0
    X-2/3X=8
    x/2+(x+1)/3>0
    x*x＋4x＋5/2
    x/(4000+0.12x) = 2
    （2x+1）（3x+2）>12
    1－x>2x－5
    18x+26（8—x）≥165 18x+26（8—x）≤190
    x+4/1-x<0
    (x+1)(x-3)<0
    <0=
    400(8000+5x-5000)≤5000000
    4000(8000+5x-5000)≤5000000
    8000+5x-5000≤5000000/4000
    8000+5x-5000≤5000000
    9-3a+2/2>6/3
    350×15+20y≤10000
    {x+1/5<3-x/5 {2x-2/3>x/3+x-2/4
    x-8<4x+1
    5x-6>4

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