Chapter 7

Gu Lu picked up the chalk and wrote down rows of formulas on a blank blackboard.

Solution four: [lnx/x11/x>lnx/x-1, that is, lnx/x1-lnx/x-1>k-1/x, that is, k-1<2xlnx/1-x^2...]

Solution 5: [...Suppose g(x)=2xlnx/1-x^2, g'(x)=(2lnx2)(1-x^2)4x^2lnx/(1-x^2)^2,

Right now……】

A blackboard was quickly filled with writing by Gu Lu.

Changing the blackboard, Gu Lu continued writing.

Solution 6:…………

Solution 7:…………

Solution 8:…………

The students below were all stunned, their eyes widened, and they were too stunned to say a word.

Throughout the classroom, only the sound of the scraping of chalk and blackboard echoed.

This is the real boss!

Many students sighed inwardly.

Compared with Gu Lu's current operation, Bi Qi's performance just now was simply not good enough.

In their opinion, it is quite good to be able to come up with three solutions to such a difficult question with the efforts of the entire class.

But Teacher Gu alone has now written six solutions on the blackboard.

Oh, no, there are seven types now!

While they were thinking just now, Gu Lu finished writing another solution.

Solution 12: [...Suppose h(x)=lnx1x^2lnx-x^2, then h'(x)=1/x2xlnx-x, so h''(x)=-1/x^22lnx-x

, when x>1...]

The four blackboards were filled with writing by Gu Lu.

He threw away the chalk, rubbed his sore wrists, and said in a calm tone, "The blackboard is so big, I can only write so much. In fact, there are fifteen ways to solve this problem. There are no remaining three.

The location has been written down, and interested students can come directly to the office and ask me."

The students in the class smiled bitterly.

Fifteen solutions...

Teacher Gu's behavior is really too cruel!

It was just an ordinary high school derivative question, but Teacher Gu went crazy and came up with fifteen postures to teach it.

Shocked! A high school mathematics teacher actually did such a crazy thing to a derivative problem!

You know, for pure people like them, when facing this kind of problem, it is difficult to figure out a single attitude!

Bi Qi, who was in the first row, looked up at Gu Lu, his eyes bright.

This new math teacher is very strong!

Bi Qi knows very well that high school mathematics teachers may not be much better than the top students in high school in terms of mathematics level alone.

The only advantage teachers have is decades of teaching experience.

Just like his previous math teacher, he would make mistakes during lectures. On several occasions, Bi Qi pointed it out in person "humbly".

However, the Teacher Gu in front of him gave him a very different feeling.

Bi Qi couldn't describe that feeling.

But he knew that Teacher Gu was definitely not the same type of person as other ordinary teachers.

Ring ring ring~~

The bell rang for the end of get out of class.

Gu Lu carried a woven bag full of mobile phones and a SLR. After briefly arranging after-get out of class tasks with his classmates, he returned to the office.

……………………

"Hey, Teacher Gu, there are quite a lot of things seized!"

Seeing Gu Lu coming in with a large bag, Zhou Haihong, who was sitting on his desk, holding a thermos cup and sipping a sip, said with a smile.

Gu Lu shrugged helplessly, "I had no choice. As soon as I entered the classroom, everyone took out their mobile phones to take pictures of me. There was also a female classmate named Su Ling who went too far and took out her SLR!"

Zhou Haihong laughed loudly, "Hahaha, this classmate holding a SLR is very spiritual!"

A young male teacher nearby who overheard the conversation between Gu Lu and Gu Lu interjected, "I think it's because you are so handsome, Teacher Gu, and those female students want to take photos as a souvenir."

"Actually, I don't want to either." Gu Lu rubbed his eyebrows, "I think the biggest mistake I made in my life is to have this face. But I can't help it, it's innate, and I'm helpless!"

Young male teacher: "..."

"By the way, Teacher Gu, put your things down and come over to me. Let's discuss something." Zhou Haihong said.

Gu Lu nodded, put the confiscated mobile phone and digital camera in the desk drawer, locked them, and then came to Zhou Haihong's desk.

The computer on Zhou Haihong's desk is playing the Baduanjin tutorial.

"Bring a chair over and sit down." Zhou Haihong calmly turned off the video, cleared his throat, turned the seat slightly, and said, "Teacher Gu, I called you over to discuss this with you.

It’s about the weekly exam questions.”

"Zhou Kao?" Gu Lu was stunned.

"Oh, yes, Teacher Gu, you just came here this year, so you probably don't know this." Zhou Haihong suddenly said, "Let me explain it to you."

Zhou Haihong and Gu Lu briefly explained.

Entering the senior year of high school, in order to maintain the students' competitive state and let them exercise their mentality.

That is to say, treat every ordinary examination as a college entrance examination, and treat the college entrance examination as an ordinary ordinary examination!

For this reason, exams are very frequent during the senior year of high school.

There are both single-subject examinations organized by individual subject teachers, and comprehensive-subject examinations organized and arranged by the school.

Of course, there are also "weekly exams" specially prepared for key classes!

Weekly exams refer to all-subject exams that only students in key classes take once a week.

The two key science classes, Seventeenth and Eighteenth, have been taking this kind of exam since the second half of the second semester of high school.

The questions for the weekly exams are all freely chosen by teachers from each subject.

Zhou Haihong is the mathematics teacher and head teacher of Class 17. What he wants to discuss with Gu Lu this time is about the mathematics test paper for the first weekly exam in the senior year of high school this week.

"My idea is that each of us will do a part. This time I will do the six big questions at the end, and you will do the choices and fill in the blanks in the front. Is that okay?" Zhou Haihong turned to look at Gu Lu.

After hesitating for a moment, Gu Lu slowly said, "Teacher Zhou, I have never given a test paper before, so I am worried..."

Gu Lu was telling the truth. Before this, he had never had the opportunity to write a test paper.

Zhou Haihong waved his hand and said comfortingly, "Teacher Gu, don't be so unsure. Setting the questions is not that difficult in the first place. If it doesn't work, just find some questions from previous years and slightly change them."

"Anyway, it's just a less formal weekly test. Don't put so much pressure on me. This time, just treat it as a practice."

Since Zhou Haihong said so, Gu Lu really had no reason to refuse.

He nodded heavily and said in a solemn tone, "Well, then I will do my best!"

There are questions in the test paper!

Gu Lu had been coveting this job for a long time, but he didn't expect that he would have such an opportunity just a few days after becoming a teacher.

In order to be worthy of this opportunity, Gu Lu decided to go all out.

Use all your skills to come up with a beautiful set of questions!

………………
Chapter completed!