Chapter 187

Of course, the title is wrong.

It was during the final exam in 2012 that Gu Lu discovered this mistake during the exam, and then raised his hand to signal to the invigilator.

The invigilator also attached great importance to it at that time and immediately notified the teacher who wrote the question for discussion.

After face-to-face discussion between the teacher and Gu Lu, it was determined that there was indeed an error in this question.

If this question is solved by normal means, two different ways of solving it will give two completely different answers.

This is because there are errors in the stems themselves.

However, since the matter was confirmed at that time, the multi-point test was over.

Therefore, after discussion, it was decided that in the process of grading, all students would be treated as full marks for this question.

At that time, this matter caused a lot of trouble in the number of hospitals.

It's just that the last test paper in the hands of the students of the Department of Mathematics is the original version before it was revised.

Without junior-level knowledge, you will not find the mistakes that exist in the stems.

However, Gu Lu thought that when students matched each other's answers, they would doubt the accuracy of the question itself if they found that two completely correct solutions would lead to two completely different answers.

But now it seems that the students have not discovered this.

Looking at the bewildered classmates in the audience, Gu Lu shook his head and smiled lightly, and then slowly spoke, "Haven't you noticed that the answers you make with different solutions are not the same?"

After Gu Lu's reminder, everyone below answered each other.

Then I was surprised to find that different solutions correspond to their own answers.

The more than forty people first glanced at each other in surprise, then raised their heads, and their puzzled eyes fell on Gu Lu.

"What the hell is this?" Bi Qi frowned, also surprised by this result.

"Complex fields. Next to him, Ma Zhengxuan lowered his head and gently spit out these three words.

"That's right, it's a plural field. Gu Lu's appreciative gaze fell on Ma Zhengxuan, "Or can it be said, multiple episodes!"

Gu Lu opened his mouth and explained to everyone without hurry, "This includes the content of the differential equation of the complex variable function, if you understand it simply, it is ......."

“…… Therefore, the stem of this problem itself is wrong, and the existence of the higher-order derivative of the complex variable function makes it necessary to define the value of the function f(x). ”

After the voice fell, Bi Qi frowned and elaborated his thoughts, "Therefore, in the stem, we must limit the real function of f(x) and not include complex fields, otherwise. Two methods of calculation, one that calculates the higher-order derivative of the complex function, and the other that does not do the calculation, will result in two completely different answers. ”

Bi Qi was originally a person with a very high talent in mathematics, and after Gu Lu mentioned this, he instantly understood.

Gu Lu nodded, "That's right, that's what Bi Qi said." ”

What do you mean?

The students were confused.

Fortunately, Gu Lu explained what Bi Qi said in easy-to-understand language, and everyone could understand it.

At the same time, I admired Bi Qi and Ma Zhengxuan a little more.

Especially Ma Zhengxuan, being able to find out the problem before Gu Lu started to explain is so awesome that it explodes!

It's just that Ma Zhengxuan is very low-key.

Regarding the admiring gaze of everyone, Ma Zhengxuan just lowered his head and ignored it.

"Teacher, I have a question?" Bai Yao, a student in the back row, raised his little hand.

"What's the problem?" Gu Lu said.

"What if we encounter this situation in the final exam, and we can't find the error in the question?" Bai Yao asked with a smile in his eyes.

Gu Lu smiled and said, "This won't be the case, because this time I will write the final test papers." ”

When the words fell, the eyes of many students below couldn't help shrinking.

Teacher Gu has a question?!

Many students have begun to tremble.

There is no way, in the course of a semester, they were almost psychologically shadowed by Gu Lu's questions.

The practice questions at the back of the textbook are completely unattractive to Mr. Gu.

Therefore, when assigning them after-class exercises, Teacher Gu did it himself.

As a result, the students of the Department of Mathematics entered a kind of homework journey that wanted to die.

Even the simplest problem would take them half an hour to complete.

As for the hardest ......

Once, after learning the chapter of indefinite integrals, Mr. Gu assigned five after-class questions.

Among them, there was one of them, and only Bi Qi, Ma Zhengxuan, and Bai Yao did it in the class.

And everyone, at least more than an hour of their time.

Everyone has a clear and accurate understanding of Teacher Gu's terrifying level of questions.

Knowing that their final exam papers were handled by Gu Lu himself, their mood was desperate.

It was like a thunderbolt from the blue.

"Liu Yang, you said we ...... You won't fail the course, will you?" said a classmate with a trembling voice to the roommate next to him.

Liu Yang swallowed hard, "No, no." I'm definitely not going to fail. ”

They are the pride of Yanda.

When I was in high school, I often got perfect marks in mathematics.

If there was a humiliating failure in a subject in the first half of his freshman year, then he would have found a piece of tofu and killed him on the spot.

Many students in the class had set a small goal to sprint for a full score in the test paper.

But after learning that the questioner was Gu Lu, they lowered their goals to passing.

Not failing the course, is their bottom line!

Seeing that the students below showed frightened expressions one by one, Gu Lu shook his head and smiled helplessly.

I...... Is it so scary?

He always thought that he was an amiable and good teacher in the minds of his classmates!

"Your expressions don't need to be so solemn, it's just a small exam, don't make it look like you're facing a great enemy. Gu Lu looked at everyone in the audience and said with a smile, "Just be normal, everyone just treat it with a normal heart." ”

Under Gu Lu's appeasement, everyone's mood barely calmed down.

"By the way, let me ask you a question?" Gu Lu suddenly thought of something, and the corners of his mouth rose slightly, "How satisfied are you with my teacher, very satisfied, satisfied, or generally satisfied, or dissatisfied." ”

"I'll do a vote, everyone take a note and write it, anonymously, just fill it in truthfully. ”

Everyone took out the slips of paper and began to fill them out.

One of the students raised his hand and asked, "Teacher, would you be angry if we were not very satisfied with what we wrote?"

"Why should I be angry?" Gu Lu looked puzzled, "I will only reflect on what I did badly, but I can't make up for it in class this semester, so I can only devote all my efforts to the final exam paper." ”

"Don't worry, it will definitely satisfy you!" Gu Lu's tone was flat, "Well, the kind that will be unforgettable for a lifetime!"

The students were all shocked.

The note was quickly collected, well, all of them were very satisfied, and Gu Lu said that he was very satisfied.