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
    1-2/x≥0
    3/x+10>2x
    x^2+2x-14大于0
    x2+2x-14大于0
    (64301-x)/(236426-x)<=0.08
    (64301-x)/(236426-x)<=0.08%
    （3n＋16）4∧（-n）≤1.6

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