"Wait, I'll give you another question!"

Laomo Cao has already started writing.

It is known that x satisfies the inequality: 2(log1/2    x)27log1/2        3≤0, then the maximum and minimum values ​​of the function f(x)=(log2     x/4)·(log2      x/2) are respectively?

"Come on this question!"

Lao Mo Cao looked serious, but many classmates were confused at this time.

Function questions?

This is definitely a nightmare for all students.

Even those students who are good at math in their first year of high school have a headache when they see it.

"Old Demon Cao is making things difficult for Xu Qian!"

"Why did you suddenly jump to the function question?"

"Who knows? Alas, why did Xu Qian insist on provoking the old demon Cao?"

"Not to say, Xu Qian's previous problem solving is so good. Is he so good at math?"

"Who knows? But this question is a bit difficult. Old Demon Cao is going to hurt people's self-confidence again."

Many classmates talked about it.

But it just...

"No!"

Xu Qian didn't even go to the podium, so he stood up, talking nonstop.

“-3<=log/2x<=-1/2.”

"When x=2 root number 2, f(x) is minimum -1/4

When x=8, f(x) is up to 2."

Laomo Cao's expression changed instantly. This question was from the mathematics book, which means that it is impossible to have it in the textbook, but Xu Qian actually told the answer in one mouthful.

How is this possible?

The other students were also shocked when they saw the expression of Cao Laomo.

"Hiss, answer the function questions on your mouth? You are going to go against the will of heaven!"

"No, right?"

"This...is impossible, just tell me the answer?"

"I must have seen this question in some exercise book!"

"Yes, right, otherwise why just tell the answer?"

Lao Mo Cao obviously also felt that Xu Qian must have seen this question somewhere, and there were standard answers on that booklet, otherwise how could he say the answer in one word?

But before he could ask, he heard Xu Qian speak again.

"We first use t=log/2x, so 2(log1/2     x)27log1/2       3≤0 becomes 2t^27t3<=0..."

Xu Qian began to explain the steps to solve the problem.

For a moment, it was silent again.

During this period, the expression on Cao Laomo's face became more and more surprised until it became solemn.

[Your problem-solving speed amazes everyone, especially the math teacher is very pleased, logical thinking-1!]
Chapter completed!