（x-2)/2>x-2
    （x-2)/2>x/2
    (x-2)/2>x/3
    6x-6x<12
    (x-2)/2
    x-2/2
    1-4/X^2<0
    1-4/X^2>0
    （x-1）*（x+2）<0
    x＾2－4x＜0
    0*x^2+2x+3<0
    2/3*x^2+2x+3<0
    1/3*x^2+2x+3<0
    1/3*x^2+2x+3<0
    (x^2+x-6)(x^2+5x+7)≥0
    h-22500/(4*h-641.6544)
    (22500/(4*h-641.6544)-h)^2<68101
    -22500/(4*h-641.6544)>259.5766553+h
    22500/(4*h-641.6544)>259.5766553+h
    22500/(4*h-641.6544)<260.961683+h

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