4x-4x^2<-3
    -3x^2+x>2
    3x+1/2-1≥x
    -3m^2-4m+4>5
    -x^2+120*x-1600>1600
    -1/2*x^2+60*x-800>800
    21m^2+16m-9＞0
    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

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