（2x-1）/x^2＜2x/（x+1）^1/2 -2（x-1）/x^1/2
    (x-5)/2>2x-1
    (x-5)2>2x-1
    2(x+4)>3x+7
    5x-1<3(x-1)
    x/2-(x-1)/3大于等于1
    x/2-(x-1)小于等于1
    (-4x^2+100x+1200)/(x^2-400)<0
    x^2-5*X<0
    lnx＜x^1/2
    lnx＜x^1/2
    (x－3)^2>(2x－1)^2
    4(k－1)+2(k+3)>0 (k－1)^2－4(k－3)>0
    (k－3)^2－4(k－1)≤0
    (k－3/k－1)^2－4/k－1≤ 0
    (k－3/k－1)^2－4/k－1<0
    3x+3≥4x+12
    (x-5)(x-2)>=0
    (x-5)(x-2)=>0
    (x-5)(x-2)>0

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