Lu Xun reacted at the first time.

This is the era of the Tang Dynasty.

The arithmetic here is not yet the mathematics of the era in which I once was.

Natural......

Things that seem simple to oneself are not simple in this society.

"I'm sorry, Mr. Bookkeeper, that didn't mean that...... Don't be surprised......"

This gesture ......

Mr. Bookkeeper's face looked a little better.

This young man is not bad!

Know how to apologize as soon as possible!

I don't know if I love the young, but this old man is a good person, and he has passed the test!

Not bad!

Not bad!

Pity......

Mr. Bookkeeper was overjoyed too soon!

He may not know how to use the word first suppress and then promote, but it doesn't matter, Lu Xun is teaching him now!

It's just that the consequence is that the bookkeeper almost slapped the table!

"Sir's arithmetic is indeed very exquisite, but it is a little cumbersome, so the kid will feel a little busy, if it can be streamlined, it will naturally be faster!"

Bang!

"Vertical arrogance!"

Mr. Bookkeeper was suddenly angry, and his beard glared directly: "Arithmetic is so rigorous, but you are delusional about streamlining, do you know how much you will lose by streamlining?" ”

"Looking for a boy, what you said is a bit too much!"

Steward Wu was also a little dissatisfied.

He doesn't know arithmetic!

But he knew that the reason why arithmetic is difficult is that it is rigorous!

Thousands of years of inheritance, how many ancestors have followed the past, and the current academic development has reached the current point!

What does it mean to be concise in the mouth of this boy?

This means a suspicion of arithmetic!

Lu Xun was a little taken aback by the attitude of the two, but he didn't expect that just this sentence would cause such dissatisfaction between the two.

He didn't think there was anything wrong with his words.

Something like arithmetic......

In the current Datang, it is naturally a little cumbersome.

It's just telling the truth!

But now......

"It's the boy Meng Lang!"

Lu Xun apologized: "It's just Old Chen, why don't you let the kid calculate?" ”

Lu Xun looked at an account book that had been placed on the side: "On that account book, Chen Lao should have already calculated the number of discrepancies, how about the kid try it?" ”

"If it's in normal times, I can give you a try, but now that the time is down, Jian'an is waiting for money and food, although my Liujiazhuang is not much, but it can also save hundreds of people, how can I have time to wait for you to figure it out...... When you figure it out, you'll have to wait until tomorrow! ”

A ledger ......

It's almost tomorrow!

He didn't have time for this arrogant boy to do such arrogant things......

"It shouldn't take until tomorrow, an hour!"

Lu Xun said, didn't pay attention to Chen Lao and them, and picked up the account book and began to flip through it.

On July 15, 48 years of Yuanhe, 15 quintals of rice were entered, and two quintals were out!

On July 16, 48 years of Yuanhe, he entered the fifteen quintals of rice, and there was no out!

On July 16, 48 years of Yuanhe, twenty quintals of rice were entered, and seven quintals were produced!

……

Yuanhe is the era name of the last era of the Tang Dynasty.

It's now the second year of meritorious service......

In other words, these ledgers are from three years ago......

This is indeed a large amount, especially the confused data above, sometimes this calculation, it will indeed be blinding.

In addition, there is some grain that is in and out of it, and even some insufficient grain, which has been sold in previous years and cashed in for money......

It's hard to figure it out!

And it's only the number in July of that year, and there are two crops here in Qingxi, Jiangnan, so in a single year, the number of this account book will be more than three!

It's just that these may be a very troublesome thing for Mr. Bookkeeper, but here in Lu Xun, it is just a very simple cashier algorithm!

Lu Xun was the president of a company in his previous life, and he was sensitive to data...

So......

A very complicated ledger in front of everyone, for him, is nothing more than the difference between + and -!

Chen Shufang was originally a little dissatisfied with the arrogance of this young man, and it could even be said that he wanted to see jokes.

But Dan saw Lu Xun sitting there......

The brush in his hand, when he sketched the so-called symbols he couldn't understand, was suddenly a little stunned.

+15？

-5？

+17？

-4？

What is this, followed by what?

He hadn't seen it, and he didn't understand what it meant, but he could see it...... This kid's speed, very fast!

It was so fast that he was dazzled, and he couldn't even use the so-called abacus, and one by one the symbols fell in his hands......

Mental arithmetic......

A basic must-have skill!

At least within 10,000, Lu Xun can still calculate it quickly, if it is exceeded, just take a pen and calculate it!

"Alright, it's done!"

After Lu Xun half an hour, Lu Xun exhaled and wrote his answer on paper......

This is Yuan and 48 years, this ledger, all the detailed discrepancies and problems!

"Okay? All right? ”

Chen was a little stunned.

Steward Wu also seemed to have heard it wrong......

But two moments and less than three quarters, even if it comes out?

"Boy, did you figure it out? Let me tell you, the old man knows very well the data in this ledger, if you dare to speak outrageously, the old man doesn't want to spare you! ”

"Lu Xun, are you sure you figured it out?"

Lu Xun shook his head: "In the 48th year of Yuanhe, the total grain intake in July was 377 quintals and half... out of 113 quintals...... The total is 266 quintals and half ......"

Smack!

This is the sound of the keyboard falling to the ground......

Split!

The abacus rolled to the ground.

There was a dull cutting sound.

But for Chen Shufang, this did not make him react, because ...... That's right!

This kid's data, right!

It took him nearly a night to calculate the data, and in less than two moments, it was already right!

How can this blow be withstanded?

But soon ......

And he reacted!

"Those symbols...... What are those symbols? You're replacing arithmetic with another symbol...... That's the key! Right? ”

Chen's obsession with arithmetic was obviously unexpected by Lu Xun......

Excitedly grabbed Lu Xun's hand, his eyes were red, and he could even say that it was a little scary.

Lu Xun actually knew when he figured out this number that it would inevitably cause movement, but he didn't expect that this old Chen account would guess the key at once!

"Yes......"

Lu Xun nodded immediately......

Indeed, it's the numbers that make the difference!

Streamlining is to increase or decrease the most complex things, which is intuitive and simple......

Doesn't that make it simple?

At that moment, it was roughly explained......

Old Chen listened to Lu Xun's explanation quietly, he didn't understand it very well, but he understood it somewhat.

And then......

Wait until Lu Xun talks about it roughly.

Suddenly, he stared at the landing ...... As if to see him through, then, clenching his fists... It's a worship:

"Boy Chen Su, Chen Qiming...... I've seen Mr., please take the kid as a disciple and teach this way of mathematics! ”