After asking Shangguan Yi these words, Wei Zheng held his forehead distressedly.

I thought to myself that I shouldn't have asked these words.

In my spare time, I couldn’t check the files of Jingyang Tianmu in my spare time at night, and everyone was tired for a day.

Wei Zheng walked in the village in Jingyang and accidentally found a big pig's hooves on the table at a family's house.

After a few more households, I looked at the dishes of each household. Basically, every household had meat to eat.

Wei Zheng, who has lived a poor life since Chang'an, is like a countryman who has never seen the world in Jingyang.

Walking on the path in the village, Wei Zheng saw the slogan painted by Jingyang on the wall, "Frugality, labor to get rich."

Eight big characters are eye-catching.

Wei Zhengwen said to an old farmer who was about to go home: "I dare to ask why the eight words on the above are written on the wall."

The old farmer glanced at the direction Wei Zheng pointed and said, "That was caused by Li Daxiong's son, saying that it was to save everyone. Until now, our family lives follow these eight big words. We dare not throw away our clothes when they are old, and we dare not waste any food."

Wei Zhengfuxu said: "It has been like this for so many years."

The old farmer glanced at Wei Zheng strangely, "Are you an official?"

Wei Zheng nodded and said, "Yes."

The old farmer said, "I'm here to check the land mu. Tell me, you officials, don't want to be a good official all day long, and you can't afford to live with Jingyang."

After saying that, the old farmer left in disgrace and did not want to pay attention to Wei Zheng anymore.

If you come to Jingyang to check the land, it will naturally make the villagers in Jingyang annoy.

After walking around the village, Wei Zheng returned to his residence.

Another day later, Wei Zheng was still checking the files of the land mu in Jingyang Prefecture. Li Yifu brought two young men here.

Wei Zheng looked up at the two young men, one of whom was the current King of Jin Li Zhi.

A group of officials from the Ministry of Revenue quickly saluted and said, "His Royal Highness of Jin."

Li Zhi quickly helped Wei Zheng up and said to the officials: "You don't need to be too polite."

Looking at everyone, Li Zhi said, "I'm just here to see how everyone is looking for it."

Wei Zheng said: "Don't worry, Your Highness, King of Jin, we will investigate fairly and strictly."

Facing Wei Zheng's words, he was accustomed to the relaxed atmosphere of Jingyang, and facing Wei Zheng's people in Chang'an and the court for a long time.

This atmosphere made Li Zhi a little difficult to adapt for a while.

There are not so many stiff words and these etiquettes in the academy.

Li Zhi looked at everyone and said, "I'll bring someone to see how you're doing."

Wei Zheng quickly handed over a file, "This is what we checked today."

Li Zhi picked up the file and looked at it. After seeing it, he frowned and said, "Do you all settle the score like this?"

Wei Zheng said: "It has always been calculated like this."

Li Zhi sighed and said, "Don't you think it would be very tiring to settle the score like this?"

Wei Zheng looked at Li Zhi in confusion.

Li Zhi sat down and picked up the pen and wrote, "Your algorithms are all about adding one account to the next account, and then adding it to get the total amount."

Wei Zheng nodded and said, "That's right."

Li Zhi said: "This calculation is not only time-consuming, but also thankless. It's like you could have to take apart the food after eating in one go. It's very useless and easy to make mistakes."

Wei Zheng looked at Li Zhi and said, "Why did Your Highness King Jin say this?"

Li Zhi wrote in front of a group of officials from the Ministry of Revenue and said: "We first assume that the total amount of grain produced in Jingyang a year is A, then the quantity per mu is B. Divide the quantity per mu of land to obtain the assumed A, and then A deduces the quantity B, and then all of them can be calculated."

All of them were confused after saying something.

Wei Zheng said, "Your Highness, King Wei, I... I didn't understand."

After a while, Wei Zheng said this with his old face in his hands.

Li Zhi also said: "When the unknown quantity sought is clearer than the known quantity, the amount sought can be set to an unknown number."

Wei Zheng was stunned for a while and said, "I dare to ask His Highness the King of Wei what unknown number is."

Li Zhi scratched his head in distress.

Di Renjie, who was standing by, wrote a simple algebraic equation and said: "You can check the numbers in this equation with the accounts you calculated to see if there is any error."

A group of officials was still confused at first sight.

Algebraic equations are a very simple equation in Jingyang Academy's mathematics, and children in their teenage years can calculate it.

But it is very difficult to teach these people in front of you.

It took a while before these officials of the Ministry of Revenue understood.

After they could use this equation, they found that the calculation was not bad at all, and it was more accurate.

Everyone seemed to have discovered a new world.

Wei Zheng also used this equation himself to calculate it and found that it was indeed the same as what he had calculated before, even if there were differences, it was only a small difference.

Looking up at Li Zhi, Wei Zheng said, "Why is this?"

Li Zhi said: "It's actually very simple. It's like counting wood. It's very difficult to count one by one, but it's much easier to calculate with height and width. It's a kind of transformation in thinking. When you have no idea about calculation from front to back, try to calculate from the end to forward, so that you will be able to understand it."

Wei Zheng said: "How did Your Highness the King of Wei learn this."

Li Zhi said: "This is just a math technique, and children in Jingyang can do it."

“Everything…is.”

Wei Zheng grabbed his beard and said, "Take it serious?"

Li Zhi said: "Some children learn slowly, maybe they don't know."

With Li Zhi's equation, the Ministry of Revenue officials checked the fields more than a few times faster.

Li Zhi said again: "If you can't figure it out, you can come to the academy to find us."

An official from the Ministry of Revenue found Li Zhi as if he had found a life-saving straw and said, "Please ask His Highness the King of Wei to help us."

Li Zhi said in surprise: "Why are you so excited?"

The official from the Ministry of Revenue said bitterly: "We have measured the land and have been broken these days. Is there any easier way?"

Li Zhi glanced at the measuring ruler that was ten feet long in their hands and said, "Follow me."

Wei Zheng saw Li Zhi leaving with his people, and he felt stormy and inexplicably felt that Li Zhi had been in Jingyang for so many years and had also met Li Zhi when he was a child in the palace. Now it seems that Li Zhi has become a different person.

The formula for the Ministry of Revenue officials to check the fields was quickly delivered to Chang'an and to Li Shimin.

Li Shimin asked Fang Xuanling, "Can this formula really check the land acres?"

Fang Xuanling said: "It can be used."

Li Shimin whispered: "So can it be used in other places?"

Fang Xuanling knew what Li Shimin was talking about. If there was this formula, many accounts that were not open could be calculated at a glance.

But such things cannot be counted. The land of the Tang Dynasty is just a bad debt, and no one dares to move around.
Chapter completed!