1. In the closed interval of 2,6, x+ 1 is positive and monotonically increasing, and the reciprocal monotonically decreasing. So when x=2, the maximum value is two-thirds; When x=6, the minimum value is two-sevenths.

2. First, x+1/x-1= (2/x-1)+1,which monotonically decreases at (1,+∞).

When a> 1, the external logarithmic function increases and the composite function decreases;

When 0

In fact, the function is not difficult, just do more questions and experience its ideas. Good luck!