After packing up their things, the two of them continued to listen to Li Zong's class on time in the afternoon.

Obviously, with Zhang Gongchuo's spirit of seeking knowledge and exploring, it is not difficult to discover the "Yang Hui Triangle".

The so-called "Yang Hui triangle" is when the binomial (ab) unfolds to the n-power.

A law that is born from the coefficients of each item.

As shown in the figure below:

"picture"

1

1    1

1    2   1

1   3    3    1

1   4   6   4   1

...

However, although this rule was discovered, how to express it, or what is the use of this rule?

These two people don't know.

Zhang Gongchuo said modestly: "I don't know if this rule is the one that my friend wants us to find? And, what's the use of this rule?"

Li Zong simply showed his skills to the two of them.

He said: "Using this, we can use it to roughly calculate the formula."

After watching Li Zong's hand calculation process, both of them looked like they could not accept it. Why is this person a shocking result?

But these are all small meanings. What Li Zong mainly talks about today is not how to calculate the prescription.

Instead, we need to talk about the binomial theorem.

And it is the expansion of the binomial theorem where exponents are fractional powers.

Final results:

As shown in the picture:

"picture"

...

I can only say that this is a very complicated proof process.

But first of all, Li Zong is not in a hurry to prove it, so he asks you whether the formula satisfies such a rule.

Just like taking (1x)2 as an example:

"picture"

Is this the reason?

The two of them looked at the knowledge points that Li Zong had thrown out. If there was no preparation before, it would be true that they could not be explained in just one sentence or two.

No wonder Li Zong wanted to create these symbols that seemed useless.

If it is converted into literal language to express it, what time does this have to be said?

This afternoon's class.

That is, the beginning is only given the answer, and some examples are checked. The specific proof process has not been given yet.

Moreover, Li Zong wanted them to try to come up with the answers themselves.

...

The class is over.

The homework has also been assigned.

In ancient times, the pace of classes was twice as slower than in modern times.

Then when Li Zong finished speaking about today's class, the two of them naturally did not leave immediately.

Zhang Gongchuo opened his mouth first, and suddenly asked Li Zong what he thought about fame.

Li Zong felt very curious and suddenly talked about what he did.

However, Li Zong still said: "Famous... it's good, it doesn't matter if it doesn't."

"Why is this?" Heng Xun asked.

Li Zong said: "Think about it, when you have fame, even if you are queuing up for medicine, it is much more convenient than others. Maybe when others hear your name, of course, what I am talking about here is the kind of people who are very famous and respected among the people. Once you meet them when you get medicine, you may ask you to arrest them first. But in the officialdom, you are an official. Famous people are a little higher than those without fame. Once you become an official, you can support your family. Speaking of which, a kid has no future in studying mathematics like this."

"That's what the boy thinks, there is, it's good."

Zhang Gongchuo: "What should I explain it if 'no, it doesn't matter'?"

Heng Xun also had such questions, because logically speaking, since Li Zong said so before, it means that Li Zong still wants to be an official.

Li Zong said: "No, it doesn't matter, it's because the boy had a serious illness five years ago. At that time, he was just a little free energy and was burping. Between life and death, the boy suddenly realized that all the fame and fortune in this world are just a passing cloud. He only has a good body, eats everything and always maintains an optimistic and open-minded mood. This is the most important thing. It is the most important thing to make yourself happy in the rest of your life. Of course, there is a prerequisite for this happiness, that is, not to hurt others."

"Now, I was born in the Li family. I don't talk about my great glory and wealth, but at least I can eat and drink by myself. This is 'nothing, it doesn't matter'."

"But, after all, you can't just look at yourself. When you think of yourself as a parent, you will definitely have a wife, children, and children in the future. Now I am in a state of strength, and it is time to stand tall and serve as a pillar of this family, and contribute to this family."

"It's a pity that the boy seems to only know mathematics."

"No! I almost forgot, I'm still very good at archery."

"Anyway... the question of you two also makes me, who is just standing on the crossroads of life, confused, and don't know where to go in the future."

"After all, it is not something that can be used for food and food."

In the past, both of them only talked about mathematics with Li Zong, but unexpectedly, this young man who was just over 1998 was so mature and steady.

But in this way, after all, life experience is not rich enough, so it also brings the unique confusion about the future life of young people.

Heng Xun waved his sleeves, "This is easy! I still know some people in the court. I will send you to the capital to be a bachelor's degree and also a job as a purgatory."

Zhang Gongchuo: "My friend, you have seen through the world, but I see, you have not even entered the world. How dare you say that you have been born? I think that instead of being so confused, hesitating about this and that, it is better to be down-to-earth and find a job to do it first."

Then Li Zong smiled: "So now I've found an errand."

The two looked at each other with Li Zongba, laughed and said, "Good boy! It turns out that you treat us as your errand. You must have known our identity a long time ago."

Li Zong said: "No. Of course I can guess the identities of you two, otherwise I can't be the fishing man on the fishing boat to ask me for advice on mathematics. But the boy has never thought about getting fame and fortune from the two, or to be precise, he doesn't expect it."

"Why?" the two of them asked directly.

So, this kid doesn't even look down on them.

Li Zong said, "Once you come, you must be idle now, and the officialdom must be unhappy."

This made Hengxun feel that he was offended.

"Secondly, although I, Li Zong, are not a phoenix, I have to find a place that I think is suitable for my stay before I can come out of the mountain."

Heng Xun then retaliated and said, "You only know how to count, do you still have such high requirements?"

And this guy is not shy about comparing himself to the phoenix!

Li Zongze did not let him revenge at all. Instead, he was really a bit fresh and handsome, elegant and elegant, generous and elegant, and said: "Young people! It's better to have a higher goal. What do you think?"

At one moment, the two of them were really attracted by his sudden demeanor. But after thinking about it, you can only get better at math, you can't tell me.

certainly!

Looking at Li Zong like this, the two were also deeply relieved.

This child may really succeed in the future.
Chapter completed!