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A>b>e (natural logarithm) compares the sizes of a b and b a.
The idea of the first floor is right. Let me add the first floor. We can give it to the first floor.

Order 4>3>e

By 4: 03.

Prove to be B.

Just prove blna

Just prove that lna/a

Constructor f(x)=(lnx)/x

But you are a freshman. I'm here to supplement it for you. The first layer means seeking guidance.

The geometric meaning of the derivative of a function is the slope of the tangent of the function at a certain point. We can imagine that if the function is tangent, its slope is always >; 0, that is to say. If the derivative of a function is always positive in a certain interval, then it increases monotonically in this interval.

The derivative of f (x) f' (x) = (1-lnx)/x 2 (this step is obviously out of the class and can be ignored).

When x>e is obviously f' (x)

That is, f(x) is simply reduced on [e, positive infinity].

Therefore, when a>b> E Shi

f(a)& lt; f(b)

lna/a & lt; lnb/b

Proof of inequality