21m2+16m-9＞0
    (1000-10n)/sqrt(n)>2
    (5000-50n)/5sqrt(n)>2
    3n^2-625n+31250>0
    3x^2-2x+1<0
    （x-3）(1-2x)<1
    0.3＜4.5/(6+x)
    8-8/(60+x)≤3
    8/(60+x)≤0.6
    8/60+x≤0.6
    3x^2+20x+12<0
    3x2+20x+12<0
    [x+2+1/2x-1][x+2-1/2x+1]<0
    2x-3≤0
    x^4-3*x^3+2*x^2>0
    -3≤1/（2x）≤0
    -3≤1/2x≤0
    -2x^2+3x-1>0
    3x^2-2x+7>=0
    （800-2x）（600-2x）≥240000

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