Since entering the Donghua Immortal Sect, Xu Yi has been diligent in practicing, and has not given up reading and understanding the various rules and classics of the Donghua Immortal Sect.

As soon as this jade plaque engraved with the word "Dian", Xu Yi recognized it as a forbidden plaque in the Classic Pavilion.

There are two major library books in Donghua Immortal Gate, one is the martial arts building that collects martial arts in the world, and the other is the classic pavilion.

Compared with the Gongfa Tower, the status of the Classic Pavilion is only high or low.

Only because the Classic Pavilion does not contain the largest number of martial arts, it contains various classics, including a small number of elixir recipes and extremely rare talismans.

This library of classics will not be simply open to the public. If you want to borrow, you either consume the merit points or use the card, which is the jade card thrown by Elder Bai at this moment.

As Xu Yi knows, this kind of card is only distributed to the Immortal Lord and Elder level. If there is no contribution, each Immortal Lord and Elder will only have three opportunities to borrow, and the number of times cannot be accumulated.

For Xu Yi, this kind of card is really too crucial.

Elder Bai said, "Please take it. This thing is left here. I haven't moved it for decades. I'm still too busy to study martial arts, so I don't have time to care about what's next. There is only one thing, you kid have a little conscience and hand over all the delicacies in your Sumeru Ring."

Xu Yi received the card and heard this, and he couldn't help but feel ache. He was a glutton, and the treasures collected in the Sumeru Ding are all treasures on earth. If Elder Bai searched them all, it would be a catastrophe to him.

As soon as he thought, he had an idea. He immediately stacked piles of bottles and jars and said with a bitter face, "That's all. If you want it, I'll help you arrange it."

Although the one taken out at this moment was extremely large, it was only one-tenth of the inventory in his Sumeru Ring.

Even though it was only one-tenth, Elder Bai was shocked. He had never seen a monk using the Sumeru Ring like this, and this time he opened his eyes.

After receiving Xu Yi's filial piety, Elder Bai threw out two booklets and asked Xu Yi to study hard, but he moved the worn rattan chair to a corner of the sun and fell asleep.

Half an hour later, Xu Yi finished reading the two booklets, which was a little unclear.

What is recorded in the two booklets is exactly the discussion about a kind of mathematical technique. It can be clearly seen that the contents in these two booklets are selected from a piece of exercise.

The key points of the "Dayan Number Theory" and "Tianji Xuan Tu" are extremely profound and intelligent. They can only be seen in a fog for a moment.

After all, his research on mathematical techniques only stayed at an extremely basic stage, or in other words, his research was purely based on utilitarianism.

Whether it is the Guiyuan Step or the Tibetan Front Style, he is limited to understanding the core of the mathematics and is unwilling to diverge. He even systematically studies what kind of ocean of mathematics is after its core extension.

At this moment, it is reasonable that he cannot comprehend the "Dayan Number Theory" and the "Tianji Xuan Tu".

Elder Bai's awakening did not last long. When he woke up, his spirit was restored. Perhaps because his mood had a sustenance, he looked less irritable and more gentle.

Elder Bai didn't talk nonsense. He pulled Xu Yi over and asked him to explain in detail what kind of mystery is hidden in the hidden style.

Xu Yi was prepared for a long time, and now he calculated the calculations for Elder Bai in the hall.

He was surprised to find that it was much easier for him to teach Elder Bai again than last time.

Obviously, Elder Bai has not been abandoned in the past month.

At the same time, Xu Yi felt a little bit of emotion: diligence can make up for his shortcomings. No matter how poor his qualifications are, finding the right direction and working hard can eventually achieve success.

After nearly two hours of calculation, Elder Bai basically understood the hidden front style. This time, he was not busy immersing in the deduction of the hidden front style. He suddenly threw a Sumeru ring to Xu Yi and hummed, "I think you know very little about the way of mathematics. I think you are just like those mediocre talents. You only regard the learning of mathematics as a skill, but do not use it as a basis."

"I just liven up the treasure mountain without knowing it. There are some mathematical research in the Sumeru Ring. You can use it to understand it thoroughly. I will test you later. If you fail the assessment, what I give you will have to pay back to me."

Speaking of this, Xu Yi could only accept it.

At this point, Elder Bai has become the thickest and strongest golden thigh he has been in the Donghua Immortal Sect. Even if he is silly, he has to hug him tightly.

The thoughts invaded the Sumeru Ring, and Xu Yi was stunned. There were not many of them, and there were hundreds of books filled with three bookshelfs.

Xu Yi was shocked and said, "Senior, even if I have talent, these..."

Elder Bai waved his hand, "I don't listen to you. I hope that in seven days, you can calculate the Dongcao scriptures and tell me the whole book."

But he said in his heart, "I finally found a coolie, how could I let it go so easily? You kid is unlucky, it's wrong. I'll serve you. It's your kid's luck..."

It turns out that the classics of mathematics that Elder Bai gave to Xu Yi are all the essence of the world's machining mathematics and techniques. Among them are the basics, and there are also high-level theories, which are carefully selected by Elder Bai's organization.

The "Dongcao Sutra" that Elder Bai just said was a part of the basic mathematics technique.

He deliberately stipulated that Xu Yi first studied the "Dongcao Jingjing" and did not consider it for Xu Yi, but for him, Bai, and he himself.

Elder Bai’s idea was to ask Xu Yi to learn first and then teach himself.

Because he found that it was really difficult to learn mathematical skills. Although he did not lack the perseverance of Yugong moving mountains, he sometimes regretted that he could not wait.

After Xu Yi talked about the mystery of Guiyuan Step and the Zangfeng style twice, Elder Bai suddenly realized that it was time-consuming and labor-intensive to study by himself. If others could study it thoroughly and then transfer it to himself, it would undoubtedly save a lot of labor and labor.

Obviously, Wang Qianqiu, the initiator, was targeted by Elder Bai.

Elder Su Bai usually said that "numbering techniques are close to the great way", but Xu Yi heard it quite reasonable.

But Xu Yi would never refuse to spend all his time studying mathematics. He really didn't have that time.

Mathematical techniques are close to the great way, and whoever wants to study will go, he is impatient anyway.

However, at this moment he had no room for rejection. Elder Bai was not a good old man. He really believed that if he dared to refuse, he would have no good results when the old man went crazy.

Having no choice but to respond and make up his mind to take it for a while. If he really can't serve him, he will only have to stay here without leaving his master.

Xu Yi responded. Elder Bai, who was obsessed with mathematics research, certainly had no time to waste time with him, so he immediately sent him out.
Chapter completed!