x+2<1 (x+1)/4>-0.5
    x+2<3x 4(x-1)
    0.24/h≤1/1.5
    310x+460(50-x)<18000
    （200+18.25*0.8b）/b≤178
    (200+18.90.8x)/x≤178
    {(a*1.25)/[0.6*(a*1.25)+0.73]}/{a/[(0.6*a)+0.73]}＞1.06
    {1.25*a/[0.53*(1.25*a)+1]}/{a/[(0.53*a)+1]}＞1.06
    {(a+1)/[0.53*(a+1)+1]}＞1.06/{a/[(0.53*a)+1]}
    {(a+1)/[0.53*(a+1)+1]}/{a/[(0.53*a)+1]}＞1.06
    {1.25*a/（1.25*a+0.73）}/{a/[(1*a)+0.73]}＞1.06
    {(a+1)/[1*(a+1)+0.73]}/{a/[(1*a)+0.73]}＞1.04
    （x*x-x*x*x+2*x）*(x*x-1)*(-x*x+4*x-8)≤0
    2*99.24-2*99.24*X≥(99.7091-X)*0.9984+99.04
    99.24-99.24X≥(99.7091-X)*0.9984+99.04
    99.15-99.15X≤（99.7091-X）*0.9984+99.04
    3*【100*（x-150）】>11000
    2400+90*(40*(1-x/100)-20)*(1-1/5)≥1716
    2400+90*(40*(1-x/100)-20)*(1-1/5)>1716
    1.2a/（1.2a+0.73）＞1.06a/（a+0.73）

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