693.7+513.8n+(20n^2+259.3n)*(40n^2+259.3n)/(518.6+40n)+40.6*(14+n)+322*(9.7+n)-1.2[755.2+1552+891n+1686+(186n+4n^2)*(186n+2.6n^2)/(372+16n)] >= 0
    693.7+513.8n+(20n^2+259.3)*(40n^2+259.3n)/(518.6+40n)+40.6*(14+n)+322*(9.7+n)-1.2[755.2+1552+891n+1686+(186n+4n^2)*(186n+2.6n^2)/(372+16n)]>=0
    2(2x-1)-3≤6 5x-1<3x+3
    3(2x-1)-3≤6 5x-1<3x+3
    -3-2x＞0
    2X-3＞0
    3-2X＞0
    -35.7+80lgx>6.5
    240x≥2x-(5-3.0005x)26
    450x+150*(600*15-600x)≥1600
    450x*100+650*(15-x)*150≥1600
    x（80000-（x-3）/0.1×2000）≥244800
    3y+1.2(18-y) ≤40
    abs（b+1-sqrt（b^2-2b-3）-6*b*((b+1-sqrt（b^2-2b-3))/2b）^2+4*b*((b+1-sqrt（b^2-2b-3))/2b）^3）小于1
    abs（b+1+sqrt（b^2-2b-3）-6*b*((b+1+sqrt（b^2-2b-3))/2b）^2+4*b*((b+1+sqrt（b^2-2b-3))/2b）^3）小于1
    abs（（b+1+sqrt（b^2-2b-3））/2b）小于1
    abs（（b+1-sqrt（b^2-2b-3））/2b）小于1
    （b+1-sqrt（b^2-2b-3））/2b小于1
    （b+1+sqrt（b^2-2b-3））/2b小于1
     6x-5≥-12

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