0.095r+164.25/r-5279.4645/(r^3)<20
    0.095r+164.25/r-5279.4645/(r^3) <20
    2<0.095r+164.25/r-5279.4645/(r^3)<20
     2 <0.095r+164.25/r-5279.464/(r^3) <20
    2<0.113r+166.95/r-5366.25/(r^3)<20
    2<0.095r+164.25/r-5279.464/(r^3)<20
    2<0.095r+1.095((60^2)/(24r)-(60^4)/(2688(r^3)))<20
    2<0.095r+1.095((60^2)/(24r)-(60^4)/(2688(r^5)))<20
    2<0.113r+166.95/r-5366.25/(r^4)<20
    2<0.113r+1.113(60^2/(24r)-60^4/2688)<20
    0.113r^4+20r^3+166.95r^2-5366.25<0
    0.113r^4+2r^3+166.95r^2-5366.25>0
    16+0.1x<0.6x
     0.6*1.12^x/2*1.08^(x/2-1)>0.5
    n≥3/2(100-n）
    0.4*(1.12*1.08)^[(x-1)/2]>0.5
    120n+90(100-n)≦10500
    n≥(3÷2)(100-n)
    5x-1>3x-4 2/3-x>=-1/3
    5x-1>3x-4

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