10x+9x≤30900－2400
    (2x-1)/5≤(x+1)/2
    x-3(x-2)>4
    x+2/3（30-x）≤41 x+2/3（30-x）≥40
    (x+4)/3-(3x-1)/2>1
    x-(x-1)/2>2-(x+2)/5
    ((x-3)/4)>1-(3(x+1)/8)
    0.5x+2-x+(2/3)<2
    （50+x）×（600-5x）≥33000
    x+1<5 2（x+4）>3x+7
    5x+1>3(x－1) 1/2x－2≤4－1.5x
    5x+1>3(x－1) 1/2x－2≤4－1.5
    5x－1<2x+5 x－1≤3x+1
    2x+1≥－1 2x+1≤3
    3x+1≥5x (x－1)/2≥－2
    (x－1)/2≤(x－2)/3+1
    X-1<2/X
    x+1 ≥2x-3
    3/x-1
    10x-5（20-x）<120

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