ln(x+1)-ln(x-1)-2/x>0
    2x＞-7
    （3x-5）（2x+7）＞0
    2x+7＞0
    （3x-5）/（2x+7）＞0
    0＜(a+13-sqrt((a+13)*(a+13)-28(a*a-a-2)))/14＜1 1＜(a+13+sqrt((a+13)*(a+13)-28(a*a-a-2)))/14＜2
    0＜(a+13-sqrt((a+13)*(a+13)-28(a*a-a-2)))/2＜1 1＜(a+13+sqrt((a+13)*(a+13)-28(a*a-a-2)))/2＜2
    （x+3）/（2x-1）≤0
    0＜(a+13)*(a+13)-28(a*a-a-2)＜1
    (a+13)*(a+13)-28(a*a-a-2)＜1
    2x-3≤-6
    2x-3≥6
    ｛3x-7≥5:6-x＞8
    4x²-20x+9＜0
    abs(x/(x+1))>x/(x+1)
    abs(1-2x)<=7
    x^(-0.5)
    x^(-0.5)>x*4000^(-1.5)
    x^(0.5)>x*4000^(-1.5)
    x^0.5>x*4000^(-1.5)

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