17x+12（31-x）<475
    5*(50-(x+2x-10))<=10*(1.5*(2x-10))
    50-2x>30-x
    10n≤12.5(360-n)
    2<0.116r+140.6625/r-3799.14/(r^3)<20
    (1.1*(1-1.1^x)*100)/-0.1>100x+10x^2
    (1.1*(1-1.1^x)*100)/-0.1<100x+10x^2
    0.095r+164.25/r-5279.4645/(r^3)<30
    0.095r+164.25/r-5279.4645/(r^3)<21
    0.095r+164.25/r-5279.4645/(r^3)<19.5
    2<0.095r+164.25/r-5279.4645/(r^3)<19.9
    0.095r+164.25/r-5279.4645/(r^3)<19
    0.095x+164.25/x-5279.4645/(x^3)<20
    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

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