Judging from the number of pages left so far, the "Analysis of High School Knowledge Base" in hand can support one lesson at most.

Taking a deep breath, Chen Xuan flipped the "Analysis of the Basic Knowledge of High School" to the position where he had bookmarked yesterday, and continued to focus on the book.

Soon, he was in the same state as yesterday again, and his whole body was carried away, as if time no longer existed, and he was alone and had a book.

Nibbling on the book "Analysis of the Knowledge Base of High School" without distraction, Chen Xuan was about to enter the next knowledge point when he suddenly felt that something was poked in his arm.

Chen Xuan looked sideways and saw a handsome girl wearing round-framed glasses and a single ponytail, holding a ballpoint pen in her hand, looking at herself embarrassedly.

"Classmate, I'm sorry to disturb you...... May I ask you a question? ”

Chen Xuan nodded indifferently, "No problem, just ask." ”

Although he was disturbed by someone while reading books, he was not angry at all.

Don't ask why, just a little emotional intelligence and you can guess it.

Here, I have to say that human beings are really an aesthetic animal, and in the interaction between people, appearance is really very important, especially in today's society.

Why did so many students find me in the library of Nuo University, and they didn't look for others?

It's not because we're more handsome than others.

Chen Xuan especially likes to talk to this kind of discerning and honest person, after all, you are too honest, and I am not good at pit you.

didn't want to do anything, it was the other party's honesty that moved Chen Xuan. In today's society, there is a lack of such honest girls.

"Thank you." whispered a thank you, and the girl tiptoed up a chair, sat next to Chen Xuan, and intimately handed over a pen and scratch paper

It is known that the maximum value of the function g(x)=ax2-2ax+1+b(a>0) in the interval [2,3] is 4 and the minimum value is 1, denoted f(x)=g(|x|)

(1) Find the values of real numbers a and b.

I don't think I've ever done this kind of question, but when I was scrolling through the book just now, I seem to have seen a similar type of question.

Habitually turning the pen, Chen Xuan thought for a while, and before he could open his mouth, he said, "It's solved." ”

"This ...... And that's it? Lu Yansheng looked at Chen Xuan in disbelief, and said in his heart, you haven't even started writing yet, how can you solve it.

Chen Xuan glanced at the girl and shook his head helplessly.

However, to be honest, he himself was also taken aback by his own speed of solving the problem, and in his residual memory, he encountered this kind of problem before, although it was easy to solve, but it would never be so easy to solve, so smooth, and even scratch paper was useless, and the solution process was clear.

is not hypocritical, Chen Xuan didn't say a word, grabbed the ballpoint pen, and wrote down the process of solving the problem on the scratch paper, and explained it while writing, "In fact, this problem is not difficult, from the symmetry axis of g(x) x=1 to get g(x) is an increasing function on the interval [2,3], and the system of equations can be obtained to find a and b." ”

Lu Yansheng stared at the draft book in a daze, only thinking that this guy's lecture speed was too fast, but he just said the first step, and then he had the answer.

"Forget it, take a look at my steps." Chen Xuan glanced at Lu Yansheng and knew that the other party couldn't adapt to his own train of thought, so after thinking about it, he wrote it again again.

"You look closely." Chen Xuan said a word, and then began to explain slowly, this time he slowed down his train of thought. “∵g（x）=a（x-1）2+1+b-a，

a>0,∴g(x) is an increasing function over the interval [2,3],

Therefore g(2)=1, g(3)=4,

Solution: a=1, b=0. So, will you be able to see it? ”

After Chen Xuan finished explaining, he looked at Lu Yansheng calmly.

Lu Yansheng didn't show a lot of shame this time, and after thinking about it carefully, he felt that the idea of this question was indeed like this, but there were some differences.

With a skeptical feeling, she opened the answer, and her eyes widened.

Is that really the answer?

Noticing the expression on this girl's face, Chen Xuan smiled faintly, turned his pen and said, "This is just a very simple quadratic function, and the calculation itself should not be difficult, speaking of which, you are a sophomore in high school, right?" Do you choose liberal arts or science? ”

Lu Yansheng's face turned red and whispered, "I'm in my third year of high school......"

As soon as she said that, her cheeks turned even redder.

Of course, it's not shy, it's!

It's so annoying, isn't it just solving a math problem? What does it smell? My knowledge of mathematics has long been suppressed by my language, but what is the matter? I really don't have any grace at all, I deserve to be a single dog, and I deserve to go to the library alone.

Thinking of this, Lu Yansheng was a little relieved.

As for being a one-person library herself, she selectively ignored it.

"Forehead" Chen Xuan's expression was slightly embarrassed, he thought it was just a sophomore senior sister, but he didn't expect to pretend to be forced on the head ......of a senior senior sister.

Looking at her expression, I guess I hate myself to death. Chen Xuan thought for a moment and showed a gentle smile, "Senior sister, don't care, in fact, you are too beautiful, which gives me a feeling of youthfulness and makes me mistakenly think that you are just a sophomore in high school." ”

"Really?" Lu Yansheng asked with some joy. Girls always like to be praised by others, not to mention that Chen Xuan is also very handsome, and when he is complimented, he can't find anything in an instant.

As for the idea that Chen Xuan was a single dog who didn't know how to be amorous, it also disappeared completely. Instead, this is a handsome guy with his own personality.

"Ahem!" After realizing that the sound of the two of them talking disturbed the others, Lu Yansheng's cheeks flushed, spit out his fragrant tongue, and returned to his place with the exercise book and scratch paper.

Chen Xuan didn't have any other thoughts, and after seeing Lu Yansheng return to his position, he continued to gnaw on his "Analysis of High School Knowledge Base", and twenty minutes of class had passed. It's also time for him to carry out the knowledge points thoroughly.

Twenty minutes later, Chen Xuan, who was immersed in the ocean of knowledge, suddenly felt that his arm was touched again. Looking sideways, it was still the same girl from before.

Chen Xuan looked at the senior sister who wanted to ask herself, but was embarrassed, and said with a gentle smile, "Do you have any doubts?" ”

"No...... No, it's a different question. Lu Yansheng's cheeks were flushed, as a senior sister, it was really embarrassing to always come to ask the junior brother.

No, no, I'm testing my junior's homework. By the way, it must be so, I'm doing this for the good of my junior.

After Chen Xuan took the pen and paper again, he glanced at the problem, then smiled faintly and said, "This problem is actually related to the previous problem, and it is also a problem of the nature of the quadratic function. ”

If the inequality f(log2k)>f(32) holds, find the range of the real number k.

"I know, but after watching it for more than ten minutes, I still don't have any ideas." Lu Yansheng said helplessly.

She had been watching it carefully for more than ten minutes, and it was completely impossible to change it in the first year of high school. However, now that the college entrance examination is coming, it is natural to focus on making up for mathematics.

Mathematics is different from the three subjects of physics, and even if she chooses liberal arts, she needs to focus on it.