The Son of Heaven doesn't have to learn mathematics, but no matter how many mothers-in-law he marries, he must be able to count them, he can't count them, and his mother-in-law helps him count them, and if the mother-in-law can't count them, it's easy to kill a few and count them.

The child's naïve and ignorant question, Li Qinzai thought of a lot, including the history of the Empress Wu.

Don't look at the relationship between the prince and the queen today, and Queen Wu is also fought out of the sea of corpses and blood in the harem.

The smiling and harmless Li Zhi in front of him seemed to be completely unaware of the cruel harem battle back then.

The harem is like a Gu nest, and the three thousand beauties treat him as a trophy and fight hard, and the winner and queen die and the loser die.

Obviously, in this cruel battle, Empress Wu became the ultimate victor, so she enjoyed her spoils alone.

Looking at Li Zhi, who was laughing, Li Qinzai's thoughts drifted far away.

Buckwheat seemed to be very pleasing to Li Zhi, and Li Zhi squatted in front of him, revealing a rare naughty look.

"The Son of Heaven is just a name, he looks no different from ordinary people, look at me, how long are a pair of eyes, how long is a mouth?"

Buckwheat didn't recognize his life, and after being with Li Qinzai, I have to say that his personality has changed a lot.

At this moment, he actually stretched out his hand, touched Li Zhi's nose, and then turned his head happily to look at Li Qinzai.

"Dad, he really looks the same as us," after Qiao'er touched it, he quickly hid behind Li Qinzai, and said: "But it's still not as handsome as Dad, Dad is more welcoming than the Son of Heaven, and he also has a beard......"

Li Qinzai's eyelids jumped, and he hurriedly apologized: "Your Majesty forgives your sins, the child's words are unscrupulous, and the dog's unintentional words ......"

Li Zhi waved his hand and said, "Okay, am I so tyrannical that I even have to take the child's words to heart?" ”

Looking at Buck Girl with a smile in his eyes, Li Zhi sighed: "My sixth son Li Xian, is the same age as Buck Girl, he was born in the fifth year of Yonghui, and he was renamed King Pei at the age of six this year. ”

Then Li Zhi smiled again: "The "Hundred Family Names" you compiled is very helpful to Mengxue, and now the princes and princesses in the palace who have not yet been enlightened have changed to your "Hundred Family Names", and in a few years, presumably the people will also take the hundred family names as the first of enlightenment, and you have made a contribution to the Tang Dynasty at the beginning of Jingchu." ”

"The minister didn't dare to take credit, the surname of the hundred families was just inadvertently compiled by the minister in order to facilitate the teaching of buckwheat, and the minister was ashamed, he didn't have the idea of making meritorious contributions to the Tang Dynasty at that time, he just thought about how to make buckwheat recognize more words."

Li Zhi laughed and said: "It doesn't matter whether you have it intentionally or unintentionally, the important thing is that you have indeed made meritorious contributions, didn't I also decree that Buckwheat should be given the title of 'Captain of Light Vehicles'?" It's not a reward, it's just a casual expression. ”

"Thank you, Your Majesty."

After chatting for a while, Li Zhi caught a glimpse of the sand on the ground, and the sand was full of numbers.

Li Zhi sighed and said, "What is this?" It's very weird and twisted, and it's used for learning? ”

Li Qinzai hesitated for a moment and said, "It's barely a study, the minister is teaching buckwheat to learn mathematics." ”

"What is 'mathematics'?"

"The study of numbers, uh, our Datang is also called 'Ming Arithmetic', and I think that children's enlightenment is not only to recognize words and endorsements, but also to learn Ming Arithmetic."

Li Zhi suddenly said: "It turned out to be a clear calculation, heh, the Ming calculation of the Tang Dynasty is based on the "Nine Chapters of Calculation", and the imperial court scientific examination will also take a number of scholars from the Ming Calculation Department, but most of the children only began to learn the Calculation Scripture at the age of thirteen or fourteen, and it is a little early for Buckwheat to be so old. ”

Li Qinzai sighed, in fact, the Tang Dynasty is very good, but there are also many drawbacks, although the monarchs and ministers are broad-minded, but the ancients' insight is not a little forward-looking after all.

Except for the emphasis on literature and martial arts and the importance of farming, I really don't care about anything else.

Li Qinzai is not too familiar with Li Zhi at the moment, and he can't figure out the temper of this emperor, so he doesn't dare to rashly admonish, seeing Li Zhi's attitude doesn't seem to pay much attention to the Ming Arithmetic Department, and Li Qinzai is not good at admonishing anything.

It is said that the emperor is moody, in case the conversation is in the mood, I don't know which hemp tendon Li Zhi bumped into, and suddenly turned his face at the banquet and shouted "Where is the knife and axe......

The first person in history to sacrifice his precious life for science, Li Qinzai did not want this honor at all.

"Yes, yes, Your Majesty is right. However, there is nothing left and right in Zhuangzi, and the minister teaches buckwheat casually when he is bored. Li Qinzai said perfunctorily.

Li Zhi noticed his perfunctory attitude, frowned, then smiled again and pointed at him.

"Jing Chu, I heard that your reputation in Chang'an City is not small, and you should be a person who is not afraid of heaven and earth, why are you so restrained in front of me? Are you afraid that I will be moody and kill people if I don't agree with each other? ”

Li Qinzai laughed dryly, if you weren't the emperor, I would dare to pinch your neck and roar hoarsely to you now, "Learn mathematics, physics and chemistry well, and you won't be afraid to go all over the world", do you believe it or not?

Li Zhi's interest suddenly fell for some reason, and he sighed gloomily: "It is said that the emperor is a lonely family, but I have always only felt that I am like ordinary people, I can eat, drink, and Lazar, and there are also birth, old age, sickness and death. ”

"Jing Chu, you have saved my life, and you have made great contributions to the society several times, I hope that you and I can be friends who have nothing to say in addition to the monarch and ministers."

"Only ruthless and unrighteous emperors think that being alone is an honor, and I never felt that way."

These words were very sincere, and Li Qinzai was slightly moved.

He suddenly felt Li Zhi's loneliness, and also felt Li Zhi's need for friends.

The emotions that men need are not only love, there are some emotions that Queen Wu can't give him, and neither can the elders and relatives.

Just like the relationship between Li Qinzai and Xue Ne, friends are relaxed and comfortable when they get along, they can completely light their backs to each other, and they can also joke and play without scruples or manners.

This kind of emotion, Li Zhi may not have gotten in his life.

Li Qinzai really wants to regard Li Zhi as a friend, but he is the son of the Tang Dynasty after all.

Li Zhicheng's mansion in the history books is not shallow, and he has done better than his father in many places, and he is by no means stupid and sweet.

However, although it is not necessary to be a friend of him, it is still right to give advice as a courtier.

After hesitating for a long time, Li Qinzai suddenly said: "The minister is willing to give a word of advice to Your Majesty, and ask Your Majesty to accept it." ”

"You say."

Li Qinzai pondered for a moment and said, "Your Majesty, have you ever remembered that the minister made a paper airplane in Taiji Palace, which can fly five or six zhang away. ”

"Remember, I still remember Jing Chu said that this thing is related to air flow, what aerodynamics, etc., I still don't know what it means."

Li Qinzai drew a standard square on the ground with a stick and said, "The minister will show your majesty a new thing." ”

Li Zhi perked up, and hurriedly raised his voice: "Wang Changfu! ”

The chamberlain Wang Changfu appeared quietly behind him like a ghost: "The slave is here." ”

Li Qinzai was taken aback, could this guy be the Yin soldier and ghost general raised by Li Zhi?

Li Zhi said in a deep voice: "Take a pen and paper, I and Jing Chu are right, you can write it." ”

Wang Changfu bowed: "The slave obeys the order." ”

When the pen and paper were taken, Wang Changfu sat down cross-legged in the courtyard, dipped the brush in ink, and hovered above the table.

Li Qinzai scratched his head: "Eh, Your Majesty, it doesn't have to be so formal......"

Li Zhi said with a smile: "What Jing Chu thought and said was of great help to me and the Tang Dynasty, and I must remember it, even if you say it, after the palace people write it down, I will have to refer to it carefully." ”

After taking a deep look at Li Zhi, Li Qinzai suddenly realized that his position in Li Zhi's mind seemed to be much more important than he imagined.

"Your Majesty, what the minister wants to advise Your Majesty is about the importance of the Ming Arithmetic Department."

"I'm listening." Li Zhi was very humble at the moment.

So Li Qinzai settled down, and on the ground covered with sand, he drew a straight line with a long stick, and drew two arrows in the same direction under the straight line.

"For example, my Tang Dynasty division fought fiercely with the enemy, the enemy army was defeated, fled on foot, and after escaping for half an hour, my Wang division sent cavalry to pursue, Your Majesty does it take for the Wang division to catch up with the enemy army?"

Li Zhi twisted his eyebrows, looking confused.

"Give a condition, the defeated enemy army can run twenty miles every hour, and the cavalry of my Tang Dynasty division can travel fifty miles every hour, and the general leading the army must know the exact time to catch up with the enemy army......"

"Just chase it, why do you need to know the exact time?" Li Zhi asked puzzled.

Li Qinzai sighed and said, "What if the direction of the enemy's rout and escape happens to be their own city?" Our generals must know if they can catch up with the enemy before they flee into the city. ”

"If you know in advance that you can catch up, you will naturally strive to catch up, and if you know that you can't catch up after calculation, you will decisively withdraw your troops and arrange the next military operation, which is the ability that a general should have when judging the situation."

Li Zhi's eyes lit up when he heard this: "Can you figure it out?" ”

"Yes."

As he spoke, Li Qinzai counted on the sand with a long stick.

"The enemy army travels twenty miles every hour, our army pursues fifty miles every hour, and the enemy army goes first for half an hour, that is, our army starts to pursue after walking ten miles, then the starting distance of the two armies is ten miles, and the formula is the distance of the pursuit minus the speed difference......"

Li Qinzai easily wrote a formula on the sand, and said indifferently: "Therefore, the time it takes for our army to pursue the enemy army is one-third of an hour, and about a little more than two quarters, our army can catch up with the enemy army and annihilate it." ”

After writing, Li Qinzai threw the long stick in his hand and smiled at Li Zhi: "If the general who leads the troops knows how to calculate, at this time he can calmly decide whether to pursue or collect the troops......"

Li Zhi was stunned, staring fixedly at the crooked Arabic numerals written on the ground, and never looked up for a long time.

"Jing Chu, what are you ......" Li Zhi shook his head vigorously and said, "What happened just now?" Why did you suddenly calculate the hour? ”

Li Qinzai said softly: "Your Majesty, this is the Ming Calculation Department, all things in the world, whether they are moving or static, can clearly define their form and speed, and grasp the laws of all things." ”

Li Zhi looked blank, turned his head to look at Wang Changfu, who was recording, and said, "Do you understand?" ”

Wang Changfu still kept the movements on the hanging pen and paper, and he didn't know the mathematical formula written by Li Qinzai just now, so he didn't record a word.

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