1600x<1500x+1500
    55（50-b）＋68b≤3200
    ((2l+0.8×(9.5-1))×(18.5-10))/((10.5-1)×10)≥1.5
    （x+1）（x－2） ≤0
    ((2d+0.8×(9.5-1))×(18.5-10))/((10.5-1)×10)≥1.5
    ((2l+0.8×(9.5-1)×(18.6-10))/((10.5-1)×10)≥1.5
    ((2l+0.8×(9.5-1)×(18.6-10))/((12-1)×10)≥1.5
    （40511+a）÷17＞（60784+a）÷26
    0.09ln(x)≤ln(2*x)
    0.09ln(x)≥ln(2*x)
    0.9ln(x)≥ln(2*x)
    0.9ln(2*x)≥ln(x)
    0.9ln(2*x)≤ln(x)
    (x+2)(x+3)>0
    (x+2)(x+3)>=0
    （x-2）（x+3）>=0
    (x+2)(x-3)>=0
    x+2>=0
    x-2>=0
    x-2>0

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