(0.005/1.086)^2+(0.01/(n*2.1335))^2<0.0001
    (0.005/1.086)^2+(0.01/(n*2.1335))^2<0.01
    （3x-1）/2<=2
    （3x-1）/2>=-3
    6（2/3x+1）>=2x-5
    7（x-1）<4x+3
    x+3>=2x
    5-2x<2x-1
    2x-7<=4x+7
    3（x-2)-1>=2(x-4)
    5x-4>=2+7x
    3x<4
    6708.95+1120.53*n+7.14*n^3+114.81*n^2-7046.04-1280.74*n-1.83*n^3-83.17*n^2≥0
    651.84*（1.67+n）+57.61*(15.5+n)+411.08*(11.5+n)-1.2*3.38*(15.73+n)-1.2*103.25*(12.51+n)-1.2*347.65*(8.19+n)-1.2*613*(2.74+n)≥0
    16.254×n×n+5.526×n×n×n-2098.25464-419.564×n≥0
    13<25x<15
    11<26x<13
    5<10x<7
    9<15x<11
    12<20x<14

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