N*129*0.2+400=3*N*129*0.8-400
    N*129*0.2+400=3N*129*0.8-400
    x^2-x-6>0
    N*129*0.2+400=3（N*129*0.2+400）
    3*（N*129*0.2+400）=N*129*0.8+400
    3*（N*129*0.2+400）=N*129*0.8-400
    3x^(2)-29x+26>0
    2(X-1)+X≥-5
    3x^(2)-29x-28>0
    2
    2x+3x>18-5x 2x+18-5x>3x 18-5x+3x>2x
    2x+3x>18-5x
    1/(2x)-lnx≤0
    1/2x-lnx≤0
    N*129*0.2+400=N*129*0.5-400
    N*129*0.2+5000=N*129*0.5-5000
    log（0.5,x-2）≥0
    N*129*0.2+5000=N*129*0.8-5000
    3N*129*0.2+50000=N*129*0.8-50000
    N*129*0.2+50000=N*129*0.8-50000

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