(1): g(x) is derived, and it can be obtained that g(x) is increasing in [1/e, e]. Draw a rough image of g(x) and solve it according to the combination of numbers and shapes.

When? -E2

(2)h(x)=lnx/x5。 Take the derivative of h(x) and it will decrease in [2,+* *].

Then to the left