30x+50（100-x）≤4000
    x^2-2x-8<0
    3x+6=0
    x+4<0
    2x-3>4x-2
    9000÷x－（9000÷1.2x）＝10
    2x-5≤2（x/2-3）
    （2y-16）^2-12(32-y^2)≥0
    0.23*0.95+1.0948*x+（1-0.23-x）*0.92<0.987
    3x^(2)-2x-3>0
    3x^(2)-2x+3>0
    abs(x+2)
    1.448*(y-100)-y>0
    326-y>0
    m-0.5<3/4m
    m-0.5<4/3m
    3500(a-1)+1200a<20000
    30+22x<220
    200*a+170*(30-a)≤5250
    250*a+210*(30-a)≤5250

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