The next day.

Anyway, it's nothing, and Li Zong got up a little late.

After getting up, he first told Uncle Ning to see if he could make a compass and a ruler for him.

Then I asked if I had heard of the nearby areas where the mountains produce black stones.

You can't find graphite, you can probably find coal mines.

Actually, Li Zong was quite worried because the place he is in now makes him feel like a water town in the south of the Yangtze River at first glance.

I won’t say much about the river nets, even the architectural styles are very similar.

But in the south, there are many mountainous areas.

I just don’t know if there is what he needs in these mountainous areas.

Although Ning Bo has lived here for generations, he asked him for a moment if he knew any black stones.

He had no impression, but he also said he would ask someone for him.

I can't make a pencil for the time being, so Li Zong had to try it with a brush dip ink.

Then I tried for a while and gave up.

Because I don't bring such a waste of paper.

I was originally thinking about drawing and deriving the area and volume calculation formulas of various geometric three-dimensional figures.

But now I can only write the text first.

Then, I turned to writing algebraic formulas.

The so-called algebraic formula is the formula obtained by algebraic operations such as adding, subtracting, multiplying, dividing, multiplying and opening of numbers through finite orders.

In fact, it is useless to learn this, at least for now, it is useless.

However, after all, the road needs to be taken step by step. Since the number has been introduced before, adding a letter to a number is a monomial, and adding an operation symbol and a number to the monomial is a polynomial. Whether it is a monomial or a polynomial, it is collectively called an integer, and an equal sign is added. If the letter can calculate the exact answer, it is an equation.

But if you don't want to come up with an exact answer, but instead make it equal to another letter, then the equation will become a function.

To be honest, he didn't think these definitions were of use after he finished writing them.

But this step is like defining something. If you don’t define it first, it will be difficult to describe and express it later.

...

Since these things are too rigid and don’t look interesting, Li Zong gave an example directly.

The simplest problem of chickens and rabbits in the same cage is used as an example to explain these nouns and their application in the problem.

The number of chicken legs, algebraic formulas 2x, and rabbit legs 4y, x, and y respectively represent the number of chickens and rabbits. These are all algebraic formulas.

Then through these algebraic equations and starting from the problem, a system of equations, also known as the "simultaneous equations".

So how to calculate this system of equations...in fact, it is related to the operation of algebraic formulas and solving equations.

When Li Zong performed the calculation of the formula, Su Yinger also felt a little incredible. How could this answer come out?

and……

Why do you multiply the first xy expression by 2 and then subtract it, so the result is out?

The things written by her husband are really eye-opening.

Li Zong didn't expect that Su Ying'er actually looked in.

He thought she would not be interested in these things at all.

However, if you think about it, this is also forced. He has no time to accompany her when he writes books, so she has to use the things he has written to study by herself.

As long as you are literate, you can understand what Li Zong wrote.

To be honest, when she first saw the problem of the chicken and rabbit in the same cage, she finally felt a little happy because she could finally understand this thing.

But because I had never learned math before, I couldn't figure it out by myself.

I can only realize all the chickens and rabbits in my mind, and then think in my mind.

Think of ten chickens on the left and ten rabbits on the right.

As long as you line up these chickens and rabbits in your mind into regular shapes, and then try and make mistakes step by step, it will probably be possible to try them out over time.

Until I saw the solution written by Li Zong on the next page...

She was immediately shocked!

However, she could understand the formulas listed above, which is why it is multiplied by two, and then subtracted, and the result is that it comes out. She is not very good at it.

...

"Why should I multiply two here?"

"Well... this is a good calculation. Didn't I say that above? Multiplying both sides by two, the result will not change."

Before Su Ying'er asked again, Li Zong said again: "The reason for subtraction in the latter is the same."

"This is called a binary equation, but I didn't expect Ying'er to understand it."

Without a certain foundation, or time to accept his system, these things still look more dazzling.

It is even very likely to be regarded as a heavenly book.

However, although Ying'er has not learned any number of numbers, at least she can still count.

As long as you know how to count, you don’t even need to know the multiplication formula. You can roughly understand what Li Zong wrote.

Whether the complex multiplication will only affect whether the final result can be obtained.

But the current situation is that the chicken legs and rabbit legs that she had been in her mind for a long time were not as good as the lines of ghost-drawing talismans of her husband.

At this moment...

She felt that these lines of ghost painting talismans had an inexplicable power.

It's like giving people a metaphysical feeling.

"Husband practices metaphysics?"

"Why do you ask that?"

"Because you have never seen these things before, Ying'er felt that they were mysterious."

Li Zong laughed silently: "I don't practice it. And... I don't have to read it so mysteriously. I am just an ordinary young man who intends to write books as his career."

‘Ordinary’… ‘The Younger’… Su Yinger thought about these two words. Her husband was so young and wrote books by himself. Others usually knew their destiny, and they would only do this after they were fifty years old.

Therefore... the younger generation is the younger generation.

It's just 'ordinary'...

But she couldn't help but feel a little suspicious, because she always felt that her husband had an indecipherable intelligence.

...

The fat man was moving very quickly. Not long after, Uncle Ning came over and said to Li Zong:

"Wuron, there is a craftsman outside the door who said he was entrusted to our house by the Wei family, look..."

After hearing this, Li Zong raised his hand and said, "That's right! I asked the Wei family to find him. Please invite him into the living room, I'll go there now."

Seeing someone coming, Ying'er suddenly became quiet. She picked up the previous written by Li Zong and read it again and again.

It was probably after about a cup of tea that Li Zong finished the interview with the craftsman.

There is definitely no problem with the carving, but you still need to be familiar with it.

Soon, he negotiated with the other party and agreed to give him a long-term business.

From then on, the carved panel will be carved by the other party.

As for whether it is necessary to keep it confidential, it seems that there is no need.

Because the engraving printing is divided into writing workers, engraving workers, and the most important thing is the printing workers, even if he asked the other party to carve it out, the other party probably didn't know what it was for.

But next, Li Zong was about to start busy.

Because the writer must be himself, the engraving worker is the other party, and then the printer will say that.

If you have a small amount, you can ask Ying'er to help.

But if you think about it, it seems that he didn't have the time to get a lot of it.

No!
Chapter completed!