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
    2x－1－x≥3x－1
    3x－6+4＜5x
    5x－5≤2x
    2x+5≤3x+6
    -8/x>-x-2
    2x＜x+2
    -(8/x)>-x-2
    3x－1＞4
    5x≤4x－1

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