480 ≤ 600-4X≤ 520
    480 ≤ 600-4X
    (8/9)b^2+4-8b<0
    (2/9)b^2+1-2b>0
    -sqrt(1+((x^(2))/(4)))+((x)/(2))>=-2x
    b/2+√(4-2b-2b^2)>1
    b/2+√(1-2b+b^2)>1
    3n＾2-13n-1900≥0
    4（e+1)>3(e-1)e^2
    -2x>2
    3-x＞0
    2x+4＞6
    103/110x＋975/22≥113
    -18<-15x^2+21x
    6x-16<-x^2
    8x^2<-14x-5
    7x-49<-20x^2
    -32x-40<6x^2
    16x<4x^2+15
    3x^2+36x+81<0

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