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
    x2+2x<8
    x-1>4x+2 (2x+1)/3>2x
    3(2x-1)>4x-5 ((3/2)x)-1<0.5x
    3(x-1)<5x+1 (2x+1)/3>2x-5

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