3x乘以2.5（2600－x）小于等于700
    3x＋2.5（2600－x）小于等于700
    -x-2>x/3
    2/3x+5>1-x
    3x+2<4x
    4x+（10-x）2.5大于等于30
    x-5>1+2x
    x+2<4x-1
    2x>1-x
    5x+8(40-x)≥257
    v^2-7v+12<=0
    3<=(2x-1)/3<4
    (x-1)/3-x/2<-1
    x-2<3x-6
    1-x>-3
    x-4<=8-2x
    4500a+3000（6-a）≥24000
    80a+50(96-a)小于等于5720
    0.001^p*(1-0.001)^(5000-p)<1/500
    3x>-3

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