a>(8-2sqrt11)/15
    a^2-16/15a+4/45<0
    5/4*a^2-4/3a+1/9<0
    2/3-x<2*sqrt(x*(1-x))
    -2*sqrt(x*(1-x))+2/3-x<0
    -2*sqrt(x*(1-x))+2/3
    -2*sqrt(x*(1-x))+1
    (5/3)x<2*sqrt(x(1-x))
    -2*sqrt(x(1-x))+(5/3)x<0
    -2*sqrt(x(1-x))+(8/3)x
    -2*sqrt(x(1-x))-1+(8/3)x+4/3
    -2*sqrt(x(1-x))+(8/3)x+4/3
    x≥((4.732/(0.00065298223*x^0.15))^0.5)-17.49*x^0.25
    x≥((4.056/(0.000518635×x^0.25))^0.5)-22×x^0.15
    x≥((4.732/(0.000518635×x^0.25))^0.5)-22×x^0.15
    a^(2)-2a-3≤0
    8x^2-3x+1>0
    3.14*R^2*2.5*1000>45
    336<2x^2+12x+16<513
    2x^2+12x+16<513

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