Since ancient times, the old emperor was in the prime of life. No matter how much favored by the emperor was in the early stage, it was inevitable to be checked and balanced in the later stage.

This is a shackle that cannot be broken, how can Li Shimin be exempt from vulgarity. Li Chengqian in history, isn't it because Li Shimin loves Li Tai.

even helped Li Tai cultivate his own forces to compete for the throne, so as to achieve the purpose of balancing the East Palace. In the end, Li Chengqian began to give up on himself, and even rebelled directly!

These are all things that have long been sealed in history. Li Shimin in the history books has achieved the ultimate perfection of the two identities of the emperor and her husband.

But other identities, sons, brothers, fathers. It's a mess, it's a mess! Zhang Zheng couldn't help but wonder if Li Shimin had all the skill points to be the emperor when he clicked them.

"Alas!" Li Chengqian sighed and rubbed his eyebrows a little tiredly. There are some things that you can't do if you don't want to.

Li Tai didn't want to, but someone might not let him get his wish. Even if there is no Li Tai, there will still be Li Zhi and Li Ke...... Li Shimin doesn't have much else, but he has many sons.

"Gone!" Zhang Zheng stood up and waved his hand with his back to Li Chengqian. He has already reminded him of this, and he believes that with Li Chengqian's wisdom, he can deal with the next things.

The premise is that Li Erbei sent Zhang Xuansu and Yu Zhining, two old-fashioned old ones, to Li Chengqian as teachers. Otherwise, Zhang Zheng would not be able to save Li Chengqian.

Walking on the road, Zhang Zheng suddenly had the idea of killing these two people in his heart? Then Zhang Zheng was taken aback by his thoughts.

When did you become so cold-blooded? Although these two people did not teach Li Chengqian well, they overwhelmed Li Chengqian with high-pressure policies.

But after all, he did not make any unfavorable moves against Li Chengqian, but on the contrary, he was still trying to protect Li Chengqian after his defeat.

"Forget it, let's take precautions!" Zhang Zheng dispelled the idea of killing them. It's just that these two people are destined to become Li Chengqian's teachers again in this historical time and space.

Because Zhang Zheng will make a hindrance from it! It's not very nice to say, let's help, save Li Chengqian's life.

Back in the filial piety hall, the little fat man Li Tai has already returned from class. What Zhang Zheng taught Li Tai was the most orthodox cramming education in later generations.

Today, Li Tai is able to flexibly use Arabic numerals, 26 letters and various operation symbols.

Today, Zhang Zheng is going to give him some perverts. The caretaker of the crazy pool, the foreman of the conscience A and B, the snail who never gives up and climbs five meters and slides down four meters, and the soldiers A and B who drive at a constant speed.

Zhang Zheng admits that there is his own bad taste in it. But Zhang Zheng feels that the torture he has suffered, others must also suffer, otherwise the psychological imbalance is not conducive to educating students!

Sure enough, Li Tai, who had not solved the problem of the crazy pool administrator for an hour. Finally couldn't help but explode!

"Sir, who is the keeper of this pool, please tell me sir that if I don't break his leg today, I won't call him Li Qingque!" Li Tai was crazy, his eyes widened like copper bells, and anger erupted from his nostrils.

"I'd love to break his leg too, but I don't know who he is!" Zhang Zheng replied to Li Tai slowly!

Zhang Zheng is really not joking with this sentence, he is serious. Li Tai gasped, and his right hand, which was holding the pen in his hand, creaked.

Zhang Zheng saw that Li Tai had indeed reached his limit. Pull out a piece of paper and slowly write down an equation on the paper!

"Take it!" Li Tai reached out and took it.

"What is this?"

"Equations, you study them first, and I'll teach you how to solve them tomorrow!" Zhang Zheng saw that it was already dark, and decided to let Li Tai relax tonight.

Because tomorrow, topics like the Crazy Pool Administrator will appear on Li Tai's desk in a steady stream.

The word equation has existed in ancient China. Written in the early years of the Eastern Han Dynasty, a nine-chapter arithmetic book, one of which is the detailed solution of equations.

Li Tai has naturally learned the arithmetic of the nine chapters, and he is no stranger to equations Li Tai. But the equation written by Zhang Zheng, every number and symbol on it, Zhang Zheng taught him.

It's just that after being put together, Li Tai can't understand it again. Li Tai studied it over and over for a while, and then asked Zhang Zheng coldly, "Sir, why is this kind of number called Arabic numerals?" ”

"Huh?" Zhang Zheng was stunned for a moment, and then replied casually: "Because this is the invention of the Tianzhu people and then transmitted to Arabia, and from Arabia to the Tang Dynasty." ”

"That's supposed to be called Tianzhu numbers, and what is Arabia, why have I never heard of this country!" Li Tai buckled the back of his head, his face full of desire to learn.

Zhang Zheng was silent for a moment, and said slowly: "It makes sense, then it is called Tianzhu number, as for Arabic, it is the language of Fanbang, and its address is probably in the generation of Persia." ”

"Persia, I heard the envoys from the Western Regions say that it is a place that is even farther away than the Western Regions."

"Yes, it's very far, from the Tang Dynasty to Persia, it takes almost a year to go back and forth." Zhang Zheng recalled the distance from Datang to the Middle East in his mind, and replied casually.

Li Tai put down the equation in his hand, sat on Li Chengqian's bed with his hands on his cheeks, and asked Zhang Zheng, "Sir, can you tell me about things other than Datang?" ”

"Yes, what do you want to hear?" Zhang Zheng put down the pen in his hand and smiled. Li Tai, this kid, is indeed very talented, no matter what knowledge he teaches him, he can almost teach it, and he can understand it at all.

I am here for these days of filial piety for Lao Li Gang. If Li Tai didn't come to accompany him, Zhang Zheng didn't know how boring he would be.

It just so happens that he has time now, and Zhang Zheng doesn't mind broadening his horizons.

"Anything, well, let's start with this Tianzhu. I've heard that the people there are fighting and riding elephants. Li Tai casually provoked a conversation, and then quietly waited for Zhang Zheng to speak.

"Tianzhu, it's fine." Zhang Zheng recalled the four ancient civilizations, and now ancient Babylon has disappeared in the dust of history.

Ancient Egypt is now being conquered by the Romans, and all the wise are about to be hanged and burned by the Pope as heretics!

The ancient Indian peninsula is now divided into hundreds of countries, large and small, and they continue to fight every year. Zhang Zheng cleared his throat and said, "Tianzhu is a country whose civilization is not much weaker than that of the Tang Dynasty. They have a splendid civilization, and they have also given birth to many sages and virtues who are no less than our ancient holy teachers and saints. This world is very big, and our Datang only occupies a very small place in this world......"

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