sqrt(x)*lnx-x+1<0
    ((ln(1+1/x))^-2)*1/(x*(1+x))>0
    ((ln(1+1/x))^-2)*1/(x*(1+x))>1
    ((ln(1+1/x))^-2)*1/(x*(1+x))-1>0
    1/(x+1)-1/(x-1)>2/x*x
    1/(x+1)-1/(x-1)+2/x*x>0
    ln(x+1)-ln(x-1)>2/x
    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

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