Lu Heng took the thick stack of paper handed over by Li Chunfeng.

didn't stand by the carriage and watch, but first took Li Chunfeng to his office.

After letting Wu Zhao make a cup of tea, he took a closer look.

But this look made Lu Heng a little surprised.

Because the stack of paper in his hand is not written on it.

It's all a series of mathematical formulas.

And the origin of these mathematical formulas seems to be similar to the nine chapters of arithmetic and other ancient mathematical books that he turned over a few days ago.

After Lu Heng carefully read a few more pages, he immediately confirmed his conjecture.

The ones in his hands were Li Chunfeng's translation of the original complicated and lonely arithmetic ancient books.

"You made it all up yourself?"

Lu Heng looked at Li Chunfeng, who had lost at least a dozen pounds in a month, and asked in surprise.

In fact, he had similar thoughts for a long time.

It's just that you want to translate all the formulas in books such as Nine Chapters of Arithmetic in Arabic numerals.

It's just too much time.

And Lu Heng obviously can't spare so much time right now.

But what he didn't expect was that Li Chunfeng was in just one month or something.

I've done the job.

In this regard, Lu Heng could only secretly say something in his heart.

"Yes, this is all made up by the lower officials in the past month."

Li Chunfeng put down the hot tea in his hand and explained to Lu Heng:

"Actually, I originally wanted to finish all the ten books of the Sutra."

"But in the process of making it, I found that there are not only many places in these calculations that are repeated."

"There are also many errors, omissions and contradictions in the calculations of various ministries."

"So in the end, I just copied everything that I thought was okay in it."

"Then I transcribed it with the numbers and operators you gave us."

"Tsk." After listening to Li Chunfeng's words, Lu Heng couldn't help but smack his tongue a little.

Because the ten books of arithmetic that Li Chunfeng said are not worthy of that book.

It is the collective name of the ten books "Zhou Ji Sutra", "Nine Chapters of Arithmetic", "Island Sutra", "Sun Tzu Sutra", "Xiahouyang Sutra", "Zhang Qiujian Sutra", "Fixation", "Five Cao Sutra", "Five Classics Arithmetic", and "Ancient Arithmetic"!

This is basically the sum of the arithmetic achievements of the Chinese generations of civilization so far in the Tang Dynasty!

You must know that most of them are the same as the most important "Nine Chapters of Arithmetic" in it.

It wasn't written by a single person at all.

Rather, by chance, generation after generation of people collected some arithmetic problems that had been studied by predecessors and compiled them into a book.

And even if it is already a book, other arithmeticians of later generations.

It will continue to be annotated, trimmed, and supplemented.

So as you can imagine, there is more to these than just ten books.

And the math problems in it are not just about one aspect.

Take the nine most important chapters of arithmetic in the ten books of arithmetic as an example.

Although this book is only a short nine chapters.

But each of its chapters represents a very different mathematical problem.

For example, "Fang Tian" in the first chapter.

It not only focuses on the calculation method of the area of the plane geometry.

It includes eight methods for calculating the area of rectangles, isosceles triangles, right-angle trapezoids, isosceles trapezoids, circles, fans, bows, and rings.

In addition, the four rules of operation of fractions and the methods of finding the greatest common divisor of the numerator and denominator are systematically described.

Not to mention that there are 38 example questions and 21 standing techniques.

It can be said that this chapter alone can already be used as a geometry teaching book in its own right.

But in the nine chapters of arithmetic, this is just an appetizer.

The next eight chapters also record mathematical problems such as proportional algorithms, open squares, open squares, and so on.

Even in its eighth and ninth chapters, there are two chapters.

He also focused on the problems related to the 'equation' and the 'Pythagorean theorem'.

The entire nine chapters of arithmetic not only record numerous mathematical methods.

What's even more commendable is that there are more than 300 application problems in it!

And Li Chunfeng was actually alone, in just one month.

He straightened out all the ten books of arithmetic, including the nine chapters of arithmetic.

I also replaced all the formulas in it with numbers and operators that I had just learned.

And all this was done on the basis that he had to attend classes during the day and could only rest for two days in ten days!!

This shows that Li Chunfeng is not only familiar with the ten books of arithmetic in the first place.

There is also extraordinary enthusiasm and ability of ordinary people!

After having this understanding, Lu Heng was looking at the thick stack of handwritten manuscripts at hand.

The movements of his hands couldn't help but be gentle.

After all, this is all someone else's hard work.

After carefully reading a few more pages, I confirmed that Li Chunfeng did not make any mistakes in the replacement of operators.

Lu Heng couldn't help but look up and say to Li Chunfeng:

"Well, you won't be teaching those kids from tomorrow."

"I'll give you a few days off, you can have a good rest."

Seeing that Li Chunfeng wanted to refuse, Lu Heng directly raised his arm and said to him:

"Don't fight with me, your body is the most important thing."

After Lu Heng finished speaking, he couldn't help but joke:

"After all, if you're really tired to death, who else will surprise me like this next time?"

Seeing that Lu Heng had indeed made up his mind, Li Chunfeng could only give up his hand and agree.

"Then thank you for your care."

Lu Heng waved his hand, indicating that it was not worthy of his thanks, and asked him while shouting the manuscript in his hand:

"And since you're showing me these, are you planning to publish them?"

"I took a look at it and thought it would be better to divide it into categories."

"It can be used as a textbook."

"It's just that the geometric shapes you drew are too abstract, and I'll have to wait for me to get the stationery out of it."

Although Li Chunfeng didn't know what the abstraction in Lu Heng's mouth meant.

But he also knew what he had drawn himself.

So he could only explain with a blushing face: "Xiaguan is indeed not good at Danqing. ”

Lu Heng shook his head, "It has nothing to do with whether you can draw or not, it's mainly because you just have a brush." ”

"When I make the compass, you can draw it later."

Lu Heng was talking to Li Chunfeng while slowly checking this precious manuscript.

At the same time, in the process, those obvious mistakes are also marked.

While explaining to Li Chunfeng, he made corrections easily.

The two of them spent a whole day in Lu Heng's office like this.

Only then was the manuscript checked.

At this time, Lu Heng simply made a decision.

directly transferred Li Chunfeng back from the position of a front-line teacher.

Let him be in charge of organizing the manuscript into a textbook.

I believe that under my own guidance, according to Li Chunfeng's strong and almost perverted work ability.

Soon he will be able to come up with a new set of mathematics textbooks that meet Lu Heng's expectations.

And when Lu Heng made errata to those errors and omissions in the manuscript.

Li Chunfeng also noticed for the first time that Lu Yuma's attainments in counting were so profound.

There were many mistakes that even he couldn't see, but Lu Heng easily found them with just one glance.

Not only that, but you can even list the correct solutions at your fingertips.

This has to make Li Chunfeng extremely impressed!