When we discuss monotonicity, we first discuss the domain. It is easy to see that x > 0 and ≠ 1. By taking the derivative of the original function, we can get, -(㏑X+( 1/X))/(X- 1)? Because (X- 1)? Must be greater than 0, so only ㏑X+( 1/X) is discussed. Let ㏑X+( 1/X) be a new function, and take the derivative again to get (X- 1)/X? , because 0 < x < 1, x- 1 < 0, x > 1, x- 1, that is, X= 1 has a minimum value, so the original function ㏑ x+(65438 so-.

I find it difficult to explain this topic. . . .