accidentally received two princesses, but unexpectedly picked up two treasures, one person and one treasure, collectively called the baby.

So Li Qinzai began to be serious, he wanted to teach Princess Xuancheng a lesson seriously, and teach what he had learned in his previous life.

Of course, Li Qinzai has forgotten a lot of what he learned in his previous life, and he can only pass on the parts he remembers to his disciples, and as for the blank parts that have been forgotten, his descendants will fill them up.

The world is big, throughout the ages, there are so many talents, there will be latecomers after Li Qinzai, what Li Qinzai wants to do is to form a fixed system of all knowledge, no matter how much is missing, as long as there is a system, it is to open a window for future generations.

In the quiet courtyard, Li Qinzai sat with Princess Xuancheng and taught her how to solve a quadratic equation.

Princess Yiyang had two heavy sandbags tied to her legs and squatted not far from them.

It didn't take long to teach, Xuancheng quickly understood, Li Qinzai was a little surprised, so he gave her a few questions, and Xuancheng solved them in a few clicks, and the answers were completely correct.

"Yes, you're very talented." Li Qinzai praised for the first time.

He did too much to ridicule the students, and suddenly praised the students, Li Qinzai was a little unaccustomed, and his tone was very stiff, as if someone was holding a knife on his neck and forcing him to praise people.

Praise people's lack of sincerity, Xuancheng didn't seem to show much pleasure, Li Qinzai had to aggravate his tone and said: "You are the most talented of all my students, don't waste your talent." ”

Xuancheng laughed at this time, she was introverted, she laughed like a spring breeze waiting for Youlan, and the branches and leaves stretched out in the wind.

"Sir, the disciple doesn't understand, what is the use of learning mathematics well?" Xuancheng said puzzledly: "It is not a sage scripture, and most of the scholars in the world will not learn it, if the disciples can learn it, what can they do with it?" ”

Before Li Qinzai could speak, Yiyang, who was squatting not far away, suddenly reprimanded: "If Mr. wants you to learn, you can learn, Mr. is knowledgeable, so many powerful people in Chang'an City have sent their children to Mr.'s door, if Mr.'s knowledge is useless, will they rush to it?" ”

After Xuancheng was reprimanded by Yiyang for a few words, he hung his head and didn't dare to squeak.

Li Qinzai said with a smile: "It's okay, the truth must be explained, otherwise if you study but don't know the goal of learning, you will give up because you are confused." ”

"The ancient sages and sages are righteous and righteous in Mingde. Mathematics and physics can be prosperous. That's what I'm teaching you these two things. ”

Xuancheng's eyes widened: "These numbers and symbols are composed of topics, can it prosper the country?" ”

"Yes, and it is the most important way to prosper the state. If you know how everything in the world works, you will know how to change it and use it to benefit the world, even a city and a country. ”

"The Tang Dynasty attacked the enemy and attacked the city, how far apart can the stone thrower accurately hit the city, what kind of arc will it cross in the air, and the winch needs to turn for a few weeks to throw the boulder perfectly into the enemy......"

"Limestone is an ore that can be found everywhere, why does it turn into ......solid cement after being burned in the kiln for a few days?"

"Craftsmen build houses, stone bricks can not be thrown on the beams of the house with all their might, but if you carry the bricks in place and turn around twice and then throw them, you can easily throw them, the principle of centrifugal force can save people a lot of physical strength and time in labor......"

Li Qinzai looked at her with a smile and said, "What you see is a phenomenon, but our knowledge is to study its principle through this phenomenon. ”

"If there are 10,000 people in Datang who understand the principle of everything, then you will find that Datang gradually has machines to replace manpower, lathes, vehicles and invincible weapons in the world."

"This is the meaning of learning this science, which uses principles that people have not discovered to skillfully liberate manpower and material resources, so that the machines made can replace people's labor and cultivation, and people can live more leisurely, or engage in more important work."

"This is how a country thrives, and this prosperity can last for thousands of years, even if it encounters war and death, it can quickly rebuild from the ruins and restore the civilization of the past."

Xuancheng was fascinated by what he heard, his hands on his cheeks, and he stared at Li Qinzai stupidly.

Even Yiyang, who was squatting on a horse, was also attracted, his half-squatting legs didn't seem to feel pain, and his mind was full of the prosperous scene that Li Qinzai said.

"Datang...... Will there be a day? "Xuancheng longs for authenticity.

Li Qinzai sighed: "There will be, but I may not be able to see it in my lifetime, and you may not be able to see it, the scene I just said requires the efforts and inheritance of several generations, and it also needs the right time, place and people." ”

"More importantly, these learnings of mine need to be carried forward, passed on from generation to generation, so that it will be more perfect, more progressive, and understand the principles of all things more deeply, if it is a spark, it needs to be passed on from generation to generation, and it will not be extinguished for thousands of years, and our world will eventually become different."

Yiyang couldn't help but say, "But sir, why does the disciple think that the disciple is not very attentive to teaching the disciple?" You...... Frequent absences from school. ”

Li Qinzai said without thinking: "Because Mr. is lazy." ”

The two princesses were dumbfounded, can the reason of laziness be so undisguised and justified?

"Sir is not a sage, Sir is only responsible for teaching students knowledge, as long as I don't teach the wrong knowledge, even if I am sick, you still have to bow respectfully when you see me, understand?"

The two princesses looked puzzled, and always felt that something was wrong with this explanation, but on the surface, it did sound a little reasonable.

Xuancheng got up and saluted Li Qinzai respectfully: "Sir, the disciple will work hard to learn well and pass on Mr.'s knowledge from generation to generation." ”

Yiyang knew that his talent was not enough, and he didn't know how to express his position for a while, so Ai Ai said after a while: "Disciple...... Will protect the good sir. ”

…………

After autumn, there is already a bit of a chill, and the leaves in the yard are also a little yellow and falling.

Taking advantage of the fact that the weather was about to turn cold, Li Qinzai stewed an old hen, and the family of three made up for it and grew some fat for the winter.

Li Qinzai's attitude towards life is obviously much more serious than his career, this is a person who lives a down-to-earth life.

The monarchs and ministers in the court are already awesome enough, with him or not, it will not affect the Tang Dynasty to be rampant and domineering in the world, Li Qinzai just lies under the big tree to enjoy the shade, and does not add chaos in the process of the Tang Dynasty sweeping the Quartet, it can be regarded as a contribution to society.

The chicken was stewed deliciously, and after boiling for two hours, the chicken soup was thick and juicy.

The family of three ate very happily, and Buckwheat had two chicken legs alone, and after eating a small mouth, he saluted the two of them in a proper manner, and turned around to run out to play.

"Come back! The slingshot was pulled out and confiscated. Li Qinzai said.

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