x/2<1
    2/x<1
    x/2<1
    80x+60(20-x)≤1440
    2x+1>5x-5
    28≤0.5x+1.5(30-x)≤30
    28≤0.5x+1.5(30-x)≤30
    (x-1)/3
    3x+3<2x+3
    90*m+50*(10-m)≤700
    x^3-x^2<1
    cos(x)^2-sin(x)^2+cos(x)+sin(x)>0
    x加3 2-x大于1
    2-x大于1 x+3
    4x+1.68x+1.16×4≥（x-16）×4+100.8
    2>-2x+3>-5
    5+1/x<0
    5+1/x<0
    lnlnlnlnlnlnx<10000
    1/x+sqrtx<0

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