3x^2+4x-15<0
    x/3-（x-2）/2＜1
    2(6-x）＞3（x-1）
    1/3x-1＞4-（4/3）x
    x-1≤3（x+1)
    3+1/3-x＞0
    （x+1）/2>=（3x+1）/5
    (651.4+25.4n^2)/(977.1+152.4n)+(2.1+n)*837.3+2082.64+323.8-1.2{[(50+3n)*(203n+7n^2)/(304.6+21.8n)]+(2.7+n)*930+(6+n)*241+(12+n)*29+(14+n)*10}>=0
    20x+5（60 -x）大于等于1000
    -671.86632-669.622*n-40.93868*n*n+1.128*n*n*n≥0
    (1-x)/0.2-1<=(x+7)/0.3-11
    (5x-3)/5-(5x-3)/4>3/20
    x-（2x+3）/5<（x-1）/4
    [n^2*(1113.372+34.992n)]/6+10134.1+1769.671n≥10262.36+1727.676n+[n^2*(390+10.809n)]/5
    2（x+1）+（x-2）/3>=7/2x-1
    2x/3>x-6
    3-x>（7x-10）/5
    1<1/m-m+1
    （3x+2）/3<=（x+5）/2-1
    （1+x）/2<=（2x+1）/3

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