Madam, protect me!

Li Nuo did not eat at Pei Zhe's house at noon today.

Although he likes Mrs. Pei's cooking, he is embarrassed to eat at other people's houses.

Of course, the fundamental reason is that Mr. Pei went on a patrol incognito today to observe the public sentiment. Mrs. Pei is the only one at home, and Li Nuo needs to avoid suspicion.

Even though there was an age difference of more than ten years between him and Mrs. Pei, people in Daxia got married relatively early, and most people got married and had children before they turned eighteen.

Mrs. Pei has been married for many years and is only in her mid-thirties this year. Her charm is still there. Li Nuo doesn't want others to spread gossip.

In the past, he would avoid being alone with her.

Fortunately, the Song Mansion was not far from the county government office. Li Nuo could go back to the Song Mansion for lunch at noon and take a nap in the wife's room after dinner.

There have been no cases in the county government these days. After today, Li Nuo won't have to go there every day.

In addition to serious cases, it is more time-saving and more efficient to deal with minor daily disputes over a few days.

The time saved can be used to read books and study.

When he first arrived, Li Nuo didn't know many things about this world.

My father's study not only has a large collection of books, but also a wide range of books.

It involves history, geography, humanities, arithmetic, music, etiquette, and various spiritual practices... It is a huge treasure trove for him.

Returning to the Song Mansion with Butler Wu, Li Nuo had just walked through the door when suddenly a figure came out of the concierge and asked in a nervous voice: "I dare to ask, is this Mr. Li Nuo?"

Li Nuo turned around, looked at this familiar old man, nodded, and said: "I am Li Nuo, old man, you are..."

Mr. Chen smiled and said, "My surname is Chen, and I am Miss Mu'er's arithmetic teacher."

Although he has never met Mr. Chen, Li Nuo has known about him for a long time.

His impression of Mr. Chen was that he had a deep understanding of "nine numbers" but was not very good at teaching. How could he give such a difficult after-school homework to a six-year-old child?

Li Nuo asked curiously: "What's wrong with Mr. Chen?"

Mr. Chen coughed lightly and said, "I have a question about arithmetic. Could you please ask me for advice?"

Mr. Chen took out a piece of paper from his sleeve. Li Nuo glanced at it and was slightly startled. Isn't this the question Mu'er asked him?

Even the words on this piece of paper were written when he was solving problems.

Because it involved trigonometric functions, she couldn't understand it yet, so Li Nuo didn't explain it in depth to her.

He also wondered how they solved this problem in an era before trigonometry.

After working on it for a long time, even her teacher couldn't do math.

etc……

Li Nuo suddenly thought of something. Mr. Chen didn't know how to solve the problem himself. There was no reason to give Mu'er an after-school homework. Co-authoring this homework was originally reserved for himself?

Being swept away by Li Nuo's gaze, Mr. Chen blushed and said, "I accidentally learned that there was a great mathematician behind Miss Mu'er, so I couldn't help but want to take the exam. Please don't blame me... "

Li Nuo couldn't bear to argue with an old man and asked: "I have written all the solutions here, why can't Mr. Chen understand?"

Mr. Chen immediately pointed to two of the lines and asked: "How did you get from here to here...?"

As Li Nuo expected, what he couldn't understand was the step of introducing trigonometric functions, but this couldn't be explained in a few words. Li Nuo said: "There is no pen here, let's go in and talk."

The two walked into the Song Mansion and came to a courtyard.

Song Jia and Song Mu'er were practicing in the courtyard. Li Nuo walked to the stone table in the courtyard and asked Mu'er to get a pen and paper. He first popularized the concept of trigonometric functions to Mr. Chen.

Mr. Chen is indeed a teacher of arithmetic. Mu'er cannot understand these things at all, but he can easily accept them.

It's not surprising when you think about it. Daxia's arithmetic originally had the concept of Pythagorean, and trigonometry is an extension of these basic concepts.

This question is just based on trigonometry, plus some ideas of transformation, reduction and combination of numbers and shapes.

When Mr. Chen has the concept of trigonometry, the next thing is very simple. He only needs to make an auxiliary line and construct an angle so that its sine value is equal to a certain coefficient in the formula, transforming the algebraic problem into a geometric problem. , the answer is clear at a glance.

After listening to Li Nuo's explanation, Mr. Chen's body trembled. He held the piece of paper in his hand and was speechless for a long time.

His hands were shaking slightly, and there were even tears flashing in his cloudy old eyes.

At this moment, something deep-rooted in his heart was completely overturned.

Can arithmetic be like this?

After studying arithmetic all his life, this was the first time he experienced the ultimate subtlety of arithmetic.

Seeing that he hadn't spoken for so long, Li Nuo asked, "What else don't you understand, sir?"

Although this problem can be mastered by junior high school students in later generations, it is still too advanced for today's arithmetic circles.

It's normal if Mr. Chen doesn't understand. Li Nuo can explain it to him again.

Mr. Chen came back to his senses and said immediately: "No, no, no, I really can't bear the title of sir. A master is a teacher. When it comes to arithmetic, I should call you sir."

Before today, he only thought that Li Nuo was a quick-thinking math genius.

It was only at this moment that Mr. Chen deeply realized how big the gap was between him and Li Nuo.

Even if he was given another ten or twenty years, he would not be able to come up with such an exquisite solution.

Unexpectedly, Mr. Chen was so polite. Li Nuo said hurriedly: "Mr. Chen's words are serious, his words are serious..."

Mr. Chen said solemnly: "I didn't say that. It's ridiculous that I have been sitting in a well and looking at the sky all my life, claiming to be a master of mathematics. Today I know that there are people who are better than people, and there are heavens beyond heaven. What I have seen in the past is just a corner of mathematics..."

He clasped his hands together, bowed deeply to Li Nuo with the courtesy of a master and a disciple, and said: "Thank you for clearing up my doubts, young master."

Li Nuo waved his hands repeatedly: "I don't deserve it, I don't deserve it..."

He knew very well that he was just standing on the shoulders of his predecessors, and Mr. Chen was just limited by the times. There was nothing to be proud of.

A figure stood not far away, staring at this scene blankly.

Song Jiaren knew that her husband was very smart, but she didn't expect that even Mr. Chen, the master of mathematics in Daxia, would ask him questions with the attitude of a student...

Mr. Chen held the paper as if it were a treasure, and asked Li Nuo carefully: "In the future, if I encounter problems that I don't understand, can I often ask you for advice?"

Li Nuo smiled and said, "It's not about asking for advice, we can discuss it together."

Mr. Chen said happily: "Thank you, thank you!"

After seeing Mr. Chen off, Song Muer ran over, hugged Li Nuo's arm, with little stars in her eyes, and said: "Brother Li Nuo, you are so amazing, you can even be the teacher of the teacher!"

Not far away, another petite figure hid most of her body behind a tree. Looking at Song Muer who was so close to Li Nuo, she stomped her feet fiercely, snorted and ran away.

When they had lunch together at noon, Li Nuo secretly glanced at the lady opposite.

Last night, he was caught peeping at her while she was asleep, which made him embarrassed for a while. Fortunately, she didn't say anything, and today, it was as if nothing happened.

It should be said that Li Nuo had a bad first impression of her.

But after so many days of contact, his impression of her is gradually changing.

She did read less books and her personality was cold and indifferent, but she was not as violent as Li Nuo thought at first. Li Nuo later realized that it was just a misunderstanding and she couldn't be blamed entirely.

After all, she was just an eighteen-year-old girl, at the age of a flower, but because of the unreliable promise of her parents more than ten years ago, she married a fool.

In the future, an eighteen-year-old girl might have just graduated from high school. If she encountered such a thing, the country would most likely intervene forcibly.

But in Daxia, such things are very common.

Even Li Nuo felt sorry for her in his heart.

Song Jiaren ate silently, and of course noticed Li Nuo's glances at her from time to time.

This made her a little uncomfortable, and she couldn't help but think of the look she saw when she woke up last night.

From childhood to adulthood, no one except him looked at her with such eyes.

Others looked at her with more fear and dissatisfaction, and later it was just fear.

And the look contained in that look..., she didn't know how to describe it, anyway, it was a new and strange experience that she had never had before.

After dinner, Li Nuo returned to the room and prepared for a nap.

Song Jiaren also returned to the room and sat at the table reading a book, still reading the book "Shuowen".

Li Nuo lay on the bed, tossing and turning, but couldn't fall asleep.

Although it was already August and the beginning of the summer heat, it was still a little hot at noon.

Song Jiaren heard the occasional noise behind her, closed the book, and asked, "Did the sound of turning pages disturb you?"

The occasional sound of turning pages was actually quite hypnotic. Li Nuo shook his head and said, "No, it's too hot and I can't sleep..."

Song Jiaren thought about it, walked to the bed, and said, "Give me your hand."

When Li Nuo was wondering, she took his hand. The next moment, Li Nuo felt a cool thing entering his body through her palm and turning around in his body. He shivered in response, and all the heat was swept away, leaving only a cool feeling...

Li Nuo has read a lot of books in the past few days, including some about martial arts. He instantly understood that the lady was practicing a cold-attributed technique, and what just entered his body was a cold-attributed true qi.

Feeling a coolness from the inside out, Li Nuo said, "Thank you."

Song Jiaren didn't say anything, returned to the table, and continued reading.

Li Nuo habitually slept with his palm as a pillow, and suddenly smelled a faint fragrance

I have never seen her use sachets or anything like that, but she always has a faint, gardenia-like fragrance.

Li Nuo has been sleeping in her bed for the past two days and has gotten used to the smell.

So much so that whenever he smells the fragrance, he feels an inexplicable sense of security, and even sleeps very soundly.

He looked at his hand that was just held by his wife, sniffed it subconsciously, and when he raised his head, he found a line of sight coming from the table, and silently said: "Wife, what bath powder are you using, it smells so good..."

[ps: I received a notice from the editor that it will be put on the shelves at midnight on the 14th. I still have some manuscripts in reserve. If I don't get stuck in the writing process and consume the manuscripts in the next few days, I should be able to write 10,000 a day by then. . ]