80+log（0.8，x-16）<=68
    2x-9x＞-7
    2x-9＞-7
    x^x＞(2x)100
    1-2a<=1
    （x+1（2x－1）＞0
    -x²＋4x－2<0
    20x+28(1800-x) <= 10000
    14-4X²≥X
    X²-7X+6>0
    X²-X-6<0
    X²-5x-6≤0
     y^2-68y+900 > 0
    80+log（0.8，x-16）<=68
    (449.093-x)*(667.79-600)-(x-427.293)*(1146.4-667.79)>=0.013*(1146.4-667.79)*(667.79-600)
    (449.093-667.193)*(667.79-600)-(667.193-427.293)*(1146.4-667.79)>=0.013*(1146.4-667.79)*(667.79-600)
    (449.093-x)*(667.79-600)-(667.193-427.293)*(1146.4-667.79)>=0.013*(1146.4-667.79)*(667.79-600)
    (449.093-x)*(667.79-600)-(x-427.293)*(1146.4-667.79)>=0.013*(1146.4-667.79)*(667.79-600)
    (449.093-x)*(862-600)-(x-427.293)*(1146.4-862)>=0.0402*(1146.4-862)*(862-600)
    (449.093-x)*(1085.6-600)-(x-427.293)*(1146.4-1085.6)>=0.02165*(1146.4-1085.6)*(1085.6-600)

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