My Identity As A Schoolmaster Has Been Exposed

Chapter 216 Do you want to listen to the second solution? (One more)

Zhu Tiesen didn’t express his surprise. After all, if even this kind of question is difficult, Xu Cong doesn’t have to test it.

But the driver had a numb scalp. A college professor looked at a topic that was rejected by a high school student as simple?

Zhu Tiesen naturally understands the weight of these questions, and smiles to Xu Cong: “It doesn’t matter if it is simple, just have a chat and pass the time.”

Xu Cong spread his hands and chuckled softly: “Yes.”

Xu Cong knows that this is what Zhu Tiesen is testing himself, just like Wu Liubai and Qian Yuejiang back then.

If you don’t give them temptation, they won’t give up! No matter if you try it or not, at least it will make them give up.

For example, some of the questions are as follows:

Remember f(x,y,z)=xᴵyᵐzⁿ+……

You can know the difficulty of this problem just by looking at the front, not to mention the many formulas in the back!

Zhu Tiesen looked at Xu Cong with soft eyes and a smile.

Xu Cong understood the meaning in the eyes of the old fox, and said lightly: “This question uses the Lagrangian formula, just expand on both sides.”

This is the proof question that the university professor is looking at!

Are you done with two sentences?

Would you respect Professor Zhu and respect these topics?

The driver watched the two people in the back row from the mirror, and began to get goose bumps all over his body.

He couldn’t help but tighten his feet when he stepped on the accelerator.

“hiss……”

He has seen what the topic that Zhu Tiesen often looks at is like, that can no longer be described by topics or numbers!

Sometimes he suspects that he has learned everything for nothing, it is simply a heavenly book!

But in the hands of Xu Cong, it’s so easy and very simple…

is that a lie!

The driver was struggling inside, and he really didn’t want to believe this fact.

But Zhu Tiesen smiled happily and said to Xu Cong, “Hahahaha, that’s right!”

He was right!

There is also a proof question on the test paper.

Given n₂², r(k) represents the remainder of n divided by k, and o(k) represents the sum of the positive factors of k. Find r(1)+r(2)++r(n)+o(1)+ o(2)++o(n)=()

Xu Cong still came here at his fingertips, and solved the problem in a few words.

“Professor, how did you see these questions?”

Zhu Tiesen frowned and asked, “What’s wrong, is there any problem?”

Xu Cong waved his hand and smiled deeply.

Seeing Xu Cong’s reaction, Zhu Tiesen felt a little puzzled. He asked aloud, “Xu Cong, what do you mean?”

Xu Cong said vaguely: “You are a professor, don’t forget your identity! Just look at this?”

What does Xu Cong mean by illocutionary? You came to test me on a question deliberately!

As a professor in the Department of Mathematics at Peking University, you would certainly not look at such a simple topic!

Zhu Tiesen reached out and touched his forehead, concealing his embarrassment: “Uh…”

He kind of got to Xu Cong’s point, he smiled awkwardly, not embarrassed to expose it.

Although these questions came to test Xu Cong, they are also difficult questions that he came into contact with, and they are not as simple as Xu Cong said!

hiss……

He didn’t answer Xu Cong’s words, but just said, “Explanation?”

Xu Cong is naturally not polite: “Obviously, r(k)=n-k[n/k], so r(1)+r(2)”

“On the other hand, for any positive integer k≤n.”

“There are exactly [n/k] in 1, 2, and n that are multiples of k, so k is calculated repeatedly [n/k] times in o(1)+O(2)++o(n), so…”

“Then combine the above two to know r(1)+r(2)++r(n)+0(1)+o(2)++o(n)=n².”

It was such an understatement when it came out of Xu Cong’s mouth.

The driver didn’t understand at all, all he heard was Ababa, and I felt like listening to the heavenly book!

But Zhu Tiesen was particularly shocked when she listened.

Is this still worth it?

This guy is useless to play straw paper, just give the steps and answers directly!

Say that this question is difficult, and it’s really not that difficult! But if it’s simple, you can’t just calculate it directly, just give the steps and answers when you say it!

Zhu Tiesen didn’t know what to say for a while, anyway, his temptation to Xu Cong directly caused him to be ill.

He is a professor in the Mathematics Department of Peking University, and he has seen countless talented students, but it is the first time he has seen someone like Xu Cong.

He is over fifty!

I have been teaching at Peking University for more than 20 years!

I was numb to the geniuses of Peking University, but today, Xu Cong let him find back what was shocking.

When Xu Cong saw Zhu Tiesen not speaking, he smiled, and said, “There is a second method, does the professor want to listen?”

Zhu Tiesen hasn’t recovered from this aspect yet, and he is still shocked that Xu Cong can use his mouth to calculate this problem. Xu Cong actually told him that there are other solutions?

Still looking at him with a smile, the meaning in it is profound, who can understand, Zhu Tiesen’s mood at the moment, maybe the driver can understand one or two…

Zhu Tiesen was awakened by his voice, and when he recovered from the question, he was shocked again.

The driver listened to the words made by Xu Cong’s style and looked at Xu Cong’s calm expression through the rearview mirror. The whole person was not good.

I rely on! I rely on!! I rely on!!!

He felt that he was too lucky at this time and offended Xu Cong when he was not in school.

Fortunately, I confessed my mistake in time!

Fortunately, Beijing Daquan School was looking for people at that time!

This is really a super peerless genius!

Looking at Zhu Tiesen again, what kind of big storms this big-time figure has never seen before? But he was still stunned, and he was directly stunned by Xu Cong!

The driver is very good at his words and opinions, he has never seen Zhu Tiesen like this, and in his mind, no one can make Zhu Tiesen show such an expression.

Generally, when Zhu Tiesen discusses issues with students, he is very comfortable, and he is in control of the audience.

But today, the driver clearly saw the micro-expression on Zhu Tiesen’s face changing, and Xu Cong was naturally aware of this.

“Ahem!”

But his words have already been said, and it is no longer realistic to take it back, but it will make people feel that he is a little artificial.

In Xu Cong’s cognition, he originally thought that Zhu Tiesen, as a professor at Peking University, should have studied all these topics, so he knew the second way of solving problems. Isn’t it right?

But what does he mean now? Or is he negligent on this question? Didn’t study in depth…?

Well, maybe it should be the case, Xu Cong reluctantly conquered himself with this statement in his heart.

Zhu Tiesen returned to his senses, somewhat embarrassed, and said to him: “Ahem, you say you say it!”

Let me say, let me say, why are you pretending to be coughing?

Hey……

That’s it!

Suddenly exposed!

Xu Cong looked at Lao Zhu like this, he couldn’t help but feel a little funny. This is not the place where there is no silver three hundred taels, so you don’t want to recruit yourself!

At the same time, Xu Cong also regretted it a little. He shouldn’t have said the last sentence, but he said it all, and he couldn’t be hypocritical, so he started to talk about the second solution.