In Chang'an City in February, although the temperature difference between morning and evening is still relatively large, with the rise of the sun, you can no longer feel the cold of winter.

In front of Guanshishan Academy, there are more and more people around, but the scene is too quiet.

People are social animals, and if they come to a noisy environment, they will say a few words if they don't want to talk.

On the other hand, if you suddenly come to a place where there are many people, but no one is talking, even if you are talking before, you will unconsciously stop.

I don't know when, Xu Jingzong has arranged for someone to move the chair and parasol over, Li Kuan sits there, drinking tea from time to time, but the taste of this tea, in Li Kuan's opinion, is really not very good, and I don't know how to endure it in the past few years.

It seems that if you find a time, you still have to get the roasted tea out.

Again, the previous grassland strategy was only partially carried out, so it was necessary to take out the artifact of tea and pull a wave of wool from the grassland.

Li Kuan was thinking about things while looking at the group of people in front of him who were frowning and thinking.

Half an hour, long and short, Li Kuan still has some patience.

"It's a problem that can't be solved at all, unless you dig a big pool of water and try it yourself."

Seeing that half an hour was about to pass, Wang Sheng slammed the brush in his hand and shouted angrily.

Li Yan on the side frowned and glanced at him, feeling that he finally had some ideas, but he was interrupted by him, and he was a little unhappy.

"Hehe, the frog at the bottom of the well, I don't know how thick the sky is. What are you, that this king needs to use this kind of subordinate means against you? Li Kuan sneered, "Yan clan, whoever dares to make trouble in the academy for a while, don't be polite to this king, and kill the king." ”

Many people who watched the lively melon-eating crowd found that after half an hour had passed, no one could really answer the question assigned by His Royal Highness the King of Chu.

Wang Sheng originally wanted to reason with Li Kuan, but saw that Li Kuan had already left, and Xu Jingzong was glaring at him with a few guards.

After thinking about it, the gentleman didn't move his mouth, so he still forgot it.

Since there is no excitement to see, many students don't even understand the question, and even if they do, they are a mess in their hearts and don't have any ideas to solve the problem.

Soon, the gate of Guanshishan Academy returned to its former tranquility.

Two huge stone monuments look down on all beings like monuments.

……

In the Xuanzheng Palace, Li Shimin heard the news of Li Zhong's report back as soon as possible.

"Kuan'er really stumped all the students who challenged with an arithmetic problem?"

To say that Li Kuan's arithmetic level is high, Li Shimin also admits it, but he didn't expect it to be so high.

Although Wang Sheng shouted at the scene that the problem was unsolvable, Li Shimin did not believe that Li Kuan would do such a cheap thing.

Some people may not be able to solve it in half an hour, but in a day or two, or even three days or five days, there are always people who can figure out this problem.

If Li Kuan really did something about the topic, it would be too short-sighted.

This is not in line with Li Shimin's understanding of him.

"Your Majesty, it's true, early this morning, several people from the Baiqi Division were watching the Lion Mountain Academy, understanding the situation from multiple angles, and striving to report the situation there to Your Majesty as soon as possible."

"Father, let me see what that arithmetic problem is, right?"

Li Zhi and his son-in-law just gave Li Shimin a bowl of abalone stewed duck soup that he learned from the Chu Palace, and the imperial chef went to learn it for a few days, and it was finally a little level, and Li Shimin was also very happy.

Unexpectedly, Li Zhong came over to report the news.

Originally, Li Zhi had never cared about the political affairs of the DPRK and China, and it was precisely because of this that Li Shimin was relieved to let him walk in the Xuanzheng Hall at any time.

It's just that what I heard today was actually related to Guanshishan Academy, and it involved arithmetic problems, and Li Zhi's interest immediately came up.

When Li Shimin heard Li Zhi speak, he didn't think much about it, and handed him the topic in his hand casually.

Baiqi Si is also safe, knowing that Li Kuan's question is very important, so he copied it word for word, but he didn't expect it to work now.

"A pool has two inlets A and B and a drain ......"

As soon as Li Zhi saw the beginning of the question, he smiled.

Although I haven't finished reading it yet, I don't know what the difference is from what the second brother taught me before, but it is obvious that this is a problem that needs to be solved by using ternary equations to solve it the fastest.

As long as the students of the School of Arithmetic of Guanshishan Academy have learned the ternary equation, nine out of ten can solve this problem within a quarter of an hour.

As for themselves......

"Father, on this question, did you stump all the disciples in Chang'an City?"

"Pheasant slave! Don't despise the people who read the world, you must know that there is a sky outside the sky, and there are people outside the world. ”

Li Shimin saw a look of pride and contempt on Li Zhi's face, and couldn't help but scold him softly.

"On this question, I can solve it with just a cup of tea, and those people can't solve it in half an hour, it's really ......" Li Zhi was not very afraid of Li Shimin, and still shook his head with an expression of contempt for those students.

Li Shimin frowned, can he solve it with a cup of tea?

Although Li Zhi showed a very amazing talent for arithmetic in the calculation of the previous household tax data, Li Shimin believed that he had a higher arithmetic level than all the students in Chang'an City......

It's hard to believe.

"Facts speak louder than words." Li Zhi didn't talk nonsense, and very unceremoniously picked up the pen and paper on the royal table, re-read the topic a few times, and then buried himself in the pen.

"Hee-hee, it's four quarters of an hour!"

It really took less than a cup of tea, and Li Zhi put down the pen in his hand, "Father, you can send someone to ask the second brother if the answer to this question is four quarters of an hour!" ”

"You've done this before?"

Li Shimin did not suspect that Li Zhi was doing it randomly, but he thought that Li Zhi had just done this question before.

After all, in the past year, he has always run to the Chu Wangfu when he has nothing to do, and he has learned a lot of miscellaneous studies in a mess, and it is not surprising that Li Kuan taught this question in advance.

"Nope! Father, I'm sure no one has seen this question before today. ”

"So how did you do it in such a short amount of time?"

Li Shimin was silent for a moment, re-read the question twice, and felt that his brain was a little dizzy.

This problem is a rare problem in the ages, and it is normal for those disciples to not be able to do it.

Although his own arithmetic level cannot be said to be very high, he also has a few brushes, and now he doesn't even understand the topic.

But Li Zhi calculated it in such a short period of time.

I can't figure it out.

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