(x-4)(x-5)>0
    x^2+15/8x-15/8<0
    9a^2-16a+4≥0
    5x<=20/x
    2-4x>3(3x-1)
    6>(x+1)^2>2
    (x+1)^2>2
    (x-3)(x-1)=0
    x-2>0
    x^2-2x-6>9
    (x-1)/(x+3)<9
    3x+10(900-x)≤6200
    1/a>0
    -2/a>0
    6X≤23
    (2m-1)^2-4(m^2-1)>0
    2m^2-4m^2-4m-5>0
     6000+（80-x）*（200-10x）-10*（400-10x） ≥ 9000
    6000+（80-x）*（200-10x）-10*（400-10x）=9000
    x^2-1>0

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