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How to do the second question? Discuss how to classify. The process of solving problems ...
The zeros of the derivative after derivation are a and X.

A & lt=0, f(x) is increasing in the topic setting interval, and there is no minimum value.

A & gt=e, f(x) decreases in the topic setting interval, and the minimum value is f (e) = a/e.

0<a<e, and the minimum value is f(a)= 1+lna.