Madam, protect me!

The next morning, when Li Nuo got up, the bedclothes had been tidied and his wife was nowhere to be seen.

He slept well overall yesterday, which was the most peaceful and comfortable sleep since he came here.

Firstly, Song Qian and the couple of Mengnan were not making trouble next door, and secondly, his wife was sleeping next to him. Before going to bed, he fell asleep peacefully with a full sense of security.

He sat on the bed and stretched his body. After getting out of bed, the toiletries had already been placed on the table.

After washing up, Li Nuo walked into the yard. He didn't see his wife, but Wu Guanjia was waiting there.

Wu Guanjia was nominally the chief steward of the Li Mansion, but his main task was to be responsible for his own safety.

Basically, he would follow Li Nuo wherever he went, and when he was outside, he would never leave him more than three steps away.

It was already late, so he informed the maid of the Song Mansion and asked her to tell his wife, and then Li Nuo left the Song Mansion and went to the Chang'an County Government.

When Li Nuo walked out of the gate of Song Mansion, he passed by an old man with gray hair.

The old man was holding a thick book in his arms. He had walked into Song Mansion for more than ten steps, stopped and looked back.

The young man looked unfamiliar. He had never seen him before and didn't know which relative of Song Mansion he was.

But none of this mattered. What was affecting his mind at the moment was another more important thing.

After half a month of testing, he was convinced that "Brother Li Nuo" mentioned by Song Muer had a deep attainment in mathematics.

Not only did he know nine numbers, but he could also explain them in an easy-to-understand way, so that a six-year-old child could understand the obscure mathematics. Even he, who had taught mathematics for a lifetime, had to admit defeat.

That kid was born to teach.

However, the question he left for the Song sisters yesterday did not belong to any of the "nine numbers". I wonder if he could still solve it.

For most people, it is enough to master the "Nine Numbers" in mathematics, because the imperial examination only tests the nine numbers, but in addition to the nine numbers, there are many other problems that involve mathematics.

For example, this problem of drinking water for horses.

Although it is not within the scope of the "Nine Numbers", it is a problem that will really be encountered on the battlefield. Speed ​​is of the essence in war. If you can be faster than the enemy, you can seize a slight advantage.

Many times, this slight advantage can determine the outcome of a war.

He has also been studying this problem recently, but has not yet found a result.

He admitted that it was indeed narrow-minded to leave such a problem that has not yet been concluded in the mathematics community to a six-year-old girl, but he has suffered too many blows these days, and he really wants to regain some face in front of his students.

"Hello, Mr. Chen."

"Hello, Mr. Chen..."

Along the way, the servants of the Song Mansion kept greeting him. The old man nodded slightly, passed through several doors, walked through several corridors, and came to a room.

Three figures, one big and two small, were already waiting in the room.

Every time he saw Song Jiaren, Mr. Chen felt guilty, thinking that he had not taught her well enough.

"Hello, Mr. Chen!"

Song Muer and Song Ninger stood up and greeted respectfully.

Mr. Chen nodded, put down the book, and asked impatiently, "Have you finished the homework I left for you yesterday?"

Song Ninger shook her head and said, "No, the homework the teacher left was too difficult. I asked Brother Yu, my father, and my second uncle, and they all said they couldn't do it..."

Mr. Chen didn't say anything. Even he and several mathematical masters hadn't figured out the answer to this question. If the Song family could do it, he would be shocked.

From beginning to end, he only cared about Brother Li Nuo in Song Muer's mouth.

When his eyes turned to Song Muer, Song Muer nodded and said, "Sir, it's done."

Song Ning'er was stunned when she heard this, and immediately questioned her, "Didn't you say you couldn't do it either?"

Song Muer glanced at her, snorted, raised his chin proudly, and said, "I can't do it, but my brother Li Nuo can..."

"Liar!"

Song Ning'er's face was dark, she hugged her arms and turned her head away.

Song Muer snorted coldly, "How many times have you lied to brother Li Nuo..."

Mr. Chen didn't want to watch the two twin sisters quarreling, so he asked hurriedly, "How did he solve it?"

He has been devoted to mathematics all his life. When he encountered a mathematical problem that others had solved but he still couldn't do it, he had been itching for a long time...

Song Muer took out a mathematics booklet from the small bag he carried with him and turned to the last page.

When Mr. Chen saw the picture for the first time, he already understood it in his heart.

He has been studying mathematics all his life, and many times, what he lacks is just a little idea and inspiration.

On this issue, this person's thinking is so ingenious.

Those lines, real and imaginary, are like a few bright lights, dispelling the fog that has shrouded his heart these days and revealing the truth under the fog.

Mr. Chen held the booklet with a strange look in his eyes, as if he was holding a rare treasure, and couldn't help laughing: "Exquisite, exquisite, really exquisite, such an exquisite solution, those old guys must not have thought of it!"

Song Jiaren glanced at the excited Mr. Chen, and an idea emerged in her mind.

Could it be that Mr. Chen also doesn't know this question?

This made her a little unbelievable. Mr. Chen is a master of mathematics in Daxia. He has no intention of pursuing a career in politics. He has devoted his life to studying mathematics. He has many students all over the world and has taught many mathematics champions.

Many officials in the court were his students. It can be said that he was absolutely at the top of the mountain in mathematics.

How could there be a mathematical problem that he couldn't solve?

Sensing Song Jiaren's gaze, Mr. Chen realized that he had lost his composure.

He coughed twice and said, "Mu'er did a good job on her homework this time. I will reward you with a flower. Mr. Chen suddenly has something urgent to do. We won't learn new content today. You can review what you have learned before..."

Song Mu'er and Song Ning'er were naturally happy that they didn't have to attend Mr. Chen's boring mathematics class. After the teacher left, they didn't remember to review and immediately ran out of the classroom to play.

Song Jiaren looked at Mr. Chen's hurriedly leaving back and thought that he must have something urgent to do. He ran while walking. An old man of his age could also walk briskly. When he crossed the threshold, he actually jumped over it...

Qingfeng Academy

As one of the four major academies in Chang'an, Qingfeng Academy has a high status in the minds of scholars in Daxia. The location of the academy is also extremely superior. It is located in the southwest of Chang'an, covering a large area. There are mountains and water in the courtyard, and the environment is extremely quiet.

This was originally a royal garden. Later, in order to reward Qingfeng Academy for its contribution to the court, a certain emperor of Daxia specially selected this royal garden as the site and built a new academy here.

The four major academies have their own strengths. Yunmeng Academy specializes in military tactics and riding and shooting, and is the cradle of military generals. Dongshan Academy is famous for its music, Beixi Academy is excellent in calligraphy and painting, and Qingfeng Academy is unique in mathematics. More than 70% of the civil servants in the court come from these four academies.

At this moment, in a small courtyard by the lake in the back mountain of Qingfeng Academy.

Three gray-haired old men in Confucian robes gathered in front of a drawing, holding a wooden ruler, and occasionally measuring something on it.

They have been studying this problem for several days.

Although the range of the answer has been measured with a ruler, mathematics is a precise subject. There is only one answer to this question. For them, it is far from enough to just determine the range, even if the range has been narrowed down by them.

As the few people were thinking, a figure suddenly walked in from outside with his hands behind his back.

The three people were thinking intently, and no one noticed.

Mr. Chen walked behind them and coughed heavily. The three heard the sound and turned back at the same time.

Mr. Chen looked at them with a disdainful look and said calmly: "You three old guys, each of you is known as a master of mathematics, how come you can't even solve such a simple problem, it really disappoints me..."

In the courtyard, the three of them turned back at the same time, and an old man with a gaunt face raised his eyebrows and asked: "Old man, did you solve it?"

Mr. Chen stroked his beard and said: "Of course, such a simple problem is not even worth my thinking for a long time. Just admit it, in mathematics, I am better than you guys..."

The three frowned slightly, the tone of this old guy was too arrogant.

The four of them were retired mathematics teachers from Qingfeng Academy. They were known as masters in the mathematics world of Daxia, and no one would admit defeat to anyone on weekdays.

An old man with a gaunt face snorted coldly and said, "Come on, let's see how you solved it..."

Mr. Chen waved his sleeves, snatched the wooden ruler from his hand, picked up the pen and drew a few real and imaginary lines on the picture, and then threw the ruler and pen on the table.

The three old men ignored him and stared at the drawing on the table.

"This..."

"The sum of the two sides of the trilateral is greater than the third side?"

"Great, moving this point over, it turns the three-place problem into a two-place problem!"

"Old man, you can come up with such a wonderful solution with your rotten head..."

They have been studying mathematics for a lifetime, and they don't need Mr. Chen to explain. Just by these simple lines, they have already understood the mystery, and they can't help but speak.

Unexpectedly, the solution to the problem that has troubled them for several days is so simple.

What they lack is just a little inspiration.

But for mathematics, this little inspiration is the most rare and the most important.

The solution to this problem seems simple, but it completely exceeds the scope of "Nine Numbers" and even the current mathematics. It is a brand new idea.

They have studied "Nine Numbers" for a lifetime, and their thinking is confined to a category, making it difficult for them to come up with new ideas.

It must be said that the old man surnamed Chen really impressed them this time.

Of course, after fighting for a lifetime, they still have some dissatisfaction in their hearts.

An old man took out a piece of paper again, handed it to Mr. Chen, and said: "Old man, take a look at this one again. If you can solve this one, I, Lu Yunting, will admit that you are better than me..."

Mr. Chen took the paper, glanced at it, put it in his sleeve, and said: "I already have a solution to this problem in my mind, but I am about to be late for the class of the two little girls in the Song Mansion. I will solve your doubts tomorrow..."

After speaking, he turned around and walked out of the courtyard without waiting for the three to speak.

After leaving Qingfeng Academy, he looked back and saw that no one followed him, so he turned around and ran towards the direction of the Song Mansion...