-3≤3x-1/3≤2
    [2/(x-0.12)]+[2/(x-0.04)]+[2/(x-0.12)]≤[x/(0.06x-0.12*0.06)]
    x-1≤7-x
    5x-2>3x+3
    [2/(x-0.2)]+[2/(x-0.04)]+[2/(x-0.12)]≤[x/(0.06x-0.12*0.06)]
    [2/(x-0.2)]+[2/(x-0.04)]+[2/(x-0.12)]≤[x/(0.02x-0.04*0.02)]
    [2/(x-0.2)]+[2/(x-0.04)]+[2/(x-0.12)]≤[x/(0.1x-0.02)]
    [2/(x-0.2)]+[2/(x-0.04)]+[2/(x-0.12)]≥[x/(0.1x-0.02)]
    2x≥3
    2x-8/x<0
    x^-3x小于等于0
    x^2-3x小于等于0
    （n－1）∧2＜4
     π×0.12×[0.46×30+(x^2-0.46)×50] ≥1.4×39
    π×0.12×[0.46×30(x^2-0.46)×50]≥1.4×39
    -5x＞9
    70x+50(30-x)<=1600
    -15000+X-（X*2%）≥4500
    3x-5＜0
    3x+3＞5x+4

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