Looking at everyone's expectant eyes, Cao Yu smiled with satisfaction, picked up the tea cup on the lectern, moistened his throat, and continued.

"This matter has to start with the tax paid in the early Han Dynasty, a family of five, no less than two people go to serve, can cultivate no more than 100 acres of land, and the annual harvest does not exceed 100 stones.

I also have to chop wood, serve in the army, pay taxes, all year round, brave the wind and rain, do not avoid the cold and heat, and have no time to rest.

The family's expenses can only be covered by that meager income. If there is a flood or drought, or if there is a rush of government and tyranny, or if you pay taxes temporarily, you have to sell grain at half price, and if you have no grain to sell, you have to borrow usury.

Afterwards, the sale of fields and houses, and even the sale of children and grandchildren to pay off debts, also appeared, and the homesteaders under the prosperity were still like this, and the decline of the world can be imagined. ”

When everyone heard this, their hearts sank.

Even Cao Zhen, who didn't understand agriculture, heard this.

His eyes were also a little moist, and he was so sad to live on military salary.

And what about the peasants who have no land outside!

Cao Cao outside the window also sighed slightly.

The words just now are clear to only him, the ruler.

How apt is that?

It's even more serious.

In particular, food and reading were monopolized by that group of scholars.

Even Cao Cao, who had military power, had no choice.

For almost all of his men were noblemen.

As for the suggestion that all the nobles should be slaughtered.

At that time, Lao Cao laughed.

Almost all of the literate people in Kyushu are scholars.

Governance and marching must not be done by people who don't know anything about big characters!

Alas!

I don't know exactly how to break these monopolies.

The people under the podium, those who listened to Cao Yu's lecture were even more resonant.

Because most of them are people who have suffered from this.

"Humph! Nonsense, even if you are right, but what does this have to do with the nine chapters of arithmetic? ”

The mustache saw that everyone was looking at Cao Yu with admiration, and he was immediately unhappy.

"The frog at the bottom of the well!"

Cao Yu glanced at his mustache, his face full of disdain.

"You ......"

"Everyone, now I will tell you why you can predict the future if you master the nine chapters of arithmetic!" Cao Yu directly interrupted the mustache, and his voice was slightly higher.

"We already know the reasons for the Yellow Turban Uprising just now, so if we calculate the annual income of the people and the taxes from the beginning, and calculate that they will work so hard, can we prevent it in advance!"

As soon as this remark came out.

Everyone slapped the back of the head in unison.

Thoroughly understood what Cao Yu meant.

Lao Cao outside the window also had a light in his eyes.

Oh, yes!

If someone had come up with such an idea at that time.

Calculate ahead and predict such an outcome.

I am afraid that the tax policy that was formulated at that time will change.

At this time.

Everyone in the classroom was digesting Cao Yu's words.

After a moment of silence, suddenly a voice sounded.

"But Mr. Cao, you did hear everything right just now, but this calculation process is too complicated!"

Cao Cao outside the window also reacted.

He controls the government and understands it best.

Know how difficult it is to keep track of people's income and expenditures.

And the more difficult thing is that the scholars will falsify the data.

If you want to beware of fraudulent data, you must use ordinary people as much as possible.

But where are so many ordinary people literate and arithmetic!

It's an endless loop.

Cao Cao shook his head slightly, smiling at Cao Yu that he was still too young.

Empty ideas, but some unrealistic.

Meanwhile.

When new questions were asked, the rest of the room seemed to find blind spots.

I want to calculate the income and expenditure of so many people.

This is equivalent to modern GDP statistics.

I'm afraid it's not enough to hit the abacus in the next village!

"Mr. Cao, this is indeed feasible in theory, but it is too difficult to operate in practice!"

"Yes, our Han literacy is already small, and it is even more difficult to be proficient in arithmetic."

"Alas! It's hard to count the people of Kyushu! It's so hard! ”

Cao Yu looked at everyone under the podium and changed his previous excitement, but was a little depressed.

Quickly pressed his hand, signaled for silence, and then cleared his throat.

"Ahem, ahem! Everyone is quiet, I know that everyone has doubts and thinks that this thing is difficult to implement! But this difficulty is only for the past—"

After a pause of two seconds, Cao Yu's voice suddenly increased.

"For the future, it will be easy!"

"And the reason for all this is related to the nine chapters of arithmetic!"

Magnetic and penetrating voices resounded through the classroom.

Cao Yu looked at everyone's shocked expressions, and the corners of his mouth rose slightly.

Is it difficult?

Addition, subtraction, multiplication and division within 100 is really difficult!

looked at Cao Yu's confident smile.

Everyone was shocked, their eyes full of disbelief.

Isn't it really that difficult?

Among them, there are many people who do not know arithmetic, and they have doubts about their own IQ.

Could it be that arithmetic is actually very simple, but I am too stupid?

While everyone was still dumbfounded, Cao Yu's voice still sounded.

The nine chapters of arithmetic are constantly introduced.

"What? Can old and young women and children be proficient in arithmetic after memorizing the multiplication formula table in three days? ”

"What? As long as you see that the ledger starts with big numbers, is it a fake account? ”

"! Chapter 9 Arithmetic does not use an abacus, and the answer is given at a glance? ”

Cao Yu casually cited a few mathematical examples commonly used in later generations.

Everyone under the podium was dumbfounded, and even the always civilized talents couldn't help but burst into foul language.

it!

Moms! Come and see that there is a Taoist priest who wants to teach the Fa!

Lao Cao outside the window was even more trembling.

Hiss –

I accidentally plucked off a handful of my beard.

Lao Cao didn't care about the pain, wiped his beard slightly, and his eyes were full of gold.

As long as you master the nine chapters of arithmetic.

Xu Du's money and food that is embezzled every year is no longer a problem.

Even people's livelihood issues are convenient for statistics and changes.

can even predict his future like predicting the Yellow Turban Uprising!

Lao Cao couldn't help but gasp again.

Boy!

This nine-chapter arithmetic is simply born for him.

I just don't know if it's true or not!

"Zhongkang, go back to the house, immediately invite Xun Lingjun here, and bring some real and fake account books!"

Come and go fast.

Now Cao Cao wants to determine whether what Cao Yu just said is true.

Oooooooo

An hour later.

The chimes of Taixue rang.

It's the sound of the end of class.

Loud voices permeate every classroom.

Cao Yu's face immediately relaxed a lot, and it was finally over.

After two hours of continuous talking, my voice became hoarse.

"Okay, class!" Cao Yu slowly got up and arched his hand.

"The green mountains do not change, the green water flows for a long time, and there will be a period in the future!"

After saying this, Cao Yu ran away.

Leave the students in the classroom still in the aftertaste.

The nine chapters of arithmetic that Cao Yu described just now is too big and too exciting.

Even Cao Zhen, who is tired of literature and martial arts, was fascinated by it.

When they reacted, they found that there was no one in the lecture hall.

"What about Mr. Cao? Well?? ”

"I haven't heard enough yet, I don't want to talk about it anymore!"

"No! Mr. Cao, you haven't said when the next class will start? ”

At this point, everyone rushed out like crazy.

Someone who wants to find Cao Yu.

As a result, I didn't even see a human figure.

And Cao Yu was already lying in the mansion at this time.

Eating a steaming hot pot.