3x一4≥1
    3-4≥1
    (x-1)/2<(3-2x)/6 (2x+1)/3>-(x-1)/4
    (x-1)/2<(3-2x)/6 (2x+1)/3>(x-1)/-4
    -3x-2>=7 x+1>=-3
    -3x-2>=7 (1) x+1>=-3 (2)
    -3x-2>=7 x+1>=-3
    2(x+1)>=3(2x+1)
    0.1990x2=0.0398
    2x^2-3x+1<0>
    abs(x-5)-abs(2x-3)<1
    105*t^(1/2)-35/4*t^(3/2)＞0
    (x-399)/x>0.4
    (x-399)/x*100%>45%
    a^4=a^2＋1/4×a^4
    99.95*X+4.79>77.77*X+8.24
    1000+160≥x
    （x-1000）+160≥x
    75x≥45
    88（30-x）+117x≤3200

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