Future library

The surprise that the elementary mental arithmetic tutorial brought to Cheng Jinzhou was far more than just his calculation ability.

In fact, when it comes to fast calculation methods, China's abacus mental arithmetic simulates the abacus in the brain, which can be used to write answers while talking about questions. However, such a fast calculation method often requires long-term practice.

In the land of Daxia Dynasty, even if Cheng Jinzhou realized the importance of calculation methods, it would be difficult for him to study in depth. Working behind closed doors is suitable for geniuses, and he is just a cheating doctor.

However, "Elementary Mental Arithmetic Tutorial" is not as simple as a simple calculation method. Cheng Jinzhou read it in order, and immediately discovered several new practical formulas, new angle and distance calculation methods, greatly simplifying the corresponding calculation process, plus fast calculation methods - this is definitely not a 21st century textbook. This judgment made him turn the book faster.

Cheng Jinzhou's surprise reflected Shen Cong's depression. Xiao Shen was just out of curiosity. He followed a 13-year-old child for two hours just to see something rare. At the end, all he saw was boiling sulfuric acid water - the sight of hot sulfuric acid boiling violently. It was indeed interesting, but the time was too short. What particularly dissatisfied Shen Cong was that Cheng Jinzhou, who he thought would be his younger brother, did not show his talent to the boss and accept him immediately. He really had no cleverness at all.

Of course, the pile of wheat that burned instantly was also very interesting, so Shen Cong kept asking: "How did you do it? What kind of star technique is this? Where is your star array engraved?"

Classmate Xiao Cheng didn't explain a word. He only looked at him arrogantly and said, "Do you know where I can find Warlock Xiang Xinxing?"

If he had proposed the same thing 20 minutes ago, classmate Shen Cong would have left him there and left him to fend for himself. But now he scratched his head in a completely different way and said, "Why don't you go to the association branch and ask? Warlocks have many methods."

"Let's go then." Cheng Jinzhou walked out of the warehouse first.

Shen Cong followed immediately and continued to ask: "Did you burn the wheat? With water and flowing acid?"

Cheng Jinzhou rolled his eyes and let him guess.

The unexpected star array and unpredictable attitude frightened classmate Shen Cong for a while. In school, anyone who can use the star array, regardless of their rank, is very stylish. When meeting a new classmate, he will After using this method, Shen Cong also calmed down.

While sitting in the car, Cheng Jinzhou concentrated on studying the newly obtained mental arithmetic tutorial.

Mathematics has always been a process from simple to complex and back to simplicity. For example, the simplest kind of cubic equation that junior high school students have to learn now is the cubic equation without quadratic terms (cubic equation without the square of At that time, the Italians regarded it as a martial arts secret book. This is also a famous koan in the history of mathematics. At that time, Ferro, a mathematics professor at the University of Bologna in Italy, successfully solved this type of equation that seems so simple today - as almost the most important mathematical achievement at that time, Ferlo Luo did not publish it publicly, but hid it and only passed it on to his student Fiore. Twenty years later, another self-taught Italian, Tartaglia, publicly announced that he had mastered the more difficult method of solving cubic equations (equations that contain quadratic terms but not linear terms). After hearing the news, the professor Fior, his apprentice, challenged Tartaglia. Like martial arts masters, the two agreed to solve 30 similar equations in 30 days...

In full view of everyone, the challenge ended dramatically. Tartaglia, who had more solutions, ended the battle in two and a half hours. At that time, Fior was still thinking hard.

However, if the two gentlemen who mastered the most advanced algebraic solutions in the world at that time were brought to China in the 21st century, there would be no need for the so-called Mathematical Olympiad classmates to intervene. There would be a lot of middle school students who could abuse them at will, because we have already mastered it. More general solutions to cubic equations, fewer calculations, less memory, faster and more accurate answers, and sufficient research in modern mathematics not only make the calculation process simpler, but also simplify the way of thinking - mathematicians use Research problems with unfamiliar and difficult formulas will ultimately require ordinary people to use them.

The same is true for "Elementary Mental Arithmetic Tutorial".

Cheng Jinzhou turned over the ring with almost gleaming eyes, which made Shen Cong sitting next to him very uneasy. When he was almost there, he couldn't help but ask: "Are you hungry?"

He still can't tell the difference between green eyes, blue eyes and golden eyes...

Xiao Cheng, who was immersed in a good learning atmosphere, couldn't care about anything else right now. He snorted twice without raising his head. Fortunately, he still remembered the story about money not being revealed, and the movements of his fingers were undetectable. , just shaking his head as if reciting.

He really needs some capital to settle down in the Great Xia Dynasty. If when he first arrived, Cheng Jinzhou, who came from a rich family, was still afraid of wanting to maintain the status quo, the actions of Cheng Bingxun and his son made him completely understand that he no longer had the care of Feiyi.

Walking on the bustling streets of the capital, the Cheng family only gave him the most basic protection - his rights as a free man. Other than that, he had to fight against everything else.

In fact, growing up, Cheng Jinzhou rarely had to fight against anything.

Shen Cong became even more depressed. Seeing that he was stabbed by a city guard in front of the second gate, he immediately sat up, slapped Cheng Jinzhou on the shoulder and said, "You didn't catch a ghost but got kidnapped by a ghost, right?"

His small body couldn't bear the heavy blow. Xiao Cheng jumped up with a "squeak" and said angrily: "What do you want to know?"

"What star array are you using?" Fortunately, Shen Cong didn't ask where the star array came from.

Cheng Jinzhou said truthfully: "There's no use for the star array."

"You lied to me."

"It's really useless to use the star array."

"impossible."

When the soil for crime is lost, there will be no crime in the world. The same principle can be applied to honesty.

Classmate Xiao Cheng is like an honest fruit in a sinful place, swaying under constant questioning.

…

The gate directly south of the inner city of Xia Jing is called Mingde Gate.

There are no buildings within 200 meters of the city gate, forming a small square-like area that is a playground for many children. A little further north, the market suddenly became bustling. At the end of the long cross street, a round building stood in the middle, with two royal guards standing guard at the door holding spears.

Apart from the imperial palace, only the Star Warlock Association can enjoy this kind of treatment.

The Xiajing branch's courtyard gate allows anyone to enter and exit, but to enter the building, certain credentials are required. Shen Cong stepped forward to explain the situation, showed the clan emblem on his belt, and then waved to Cheng Jinzhou. At this moment, he took control again, pulled Xiao Cheng and said: "Don't run around here, I will protect you if something happens." I can’t save you.”

Cheng Jinzhou raised his head and looked around. This was his first time coming to the Star Warlock Association.

Looking from the outside in, the association looks like a Chinese coffee shop plus a library. Many people were sitting around the round table talking, and waiters shuttled among them. Beyond the several hundred square meters of space was a stone door with two-story wooden shelves filled with books. In comparison, the people outside Shimen were overcrowded, but the people inside Shimen were pitifully few. Many people looked inside like Cheng Jinzhou, but no one was seen entering or leaving.

Shen Cong found a free table and sat down, ordered a few things at random, tore off a page from the paper stapled at the corner of the table, wrote down his inquiry, and handed it to the dedicated waiter.

"Is this okay?" Cheng Jinzhou noticed his movements and asked in confusion.

"Can you expect the Star Warlock to greet you personally?" Shen Cong sneered.

Before Cheng Jinzhou could speak, a playful voice came from behind, jokingly saying: "Little aunt, where did you find this country noble?"

Hearing the words "little aunt", Shen Cong's expression changed, he stood up with a "hula" and the bench was kicked away.

Cheng Jinzhou looked closely and saw four young men wearing white robes and holding fans. They were about the same age as Shen Cong, and they were more oily and powdery.

Naturally, no one is allowed to bring people in at the association branch. Shen Cong is not tall. Standing at the edge of the table, he looks a little alone.

"What, you're a math idiot, what are you doing in the association? Can't you beg others to take pity on you?" The leading boy slapped his palms rhythmically with his fan bone, but the sound was not loud, just like chatting with old friends.

Shen Cong gritted his teeth and said nothing. The laughter and curses among the aristocratic children were often not so innocent, and the young man's moves were even more insignificant. He couldn't hit the four opponents, so he just glared at them.

"You are just like your mother, little aunt." The guy standing at the front spat in a low voice that only the two or three people around him could hear.

My aunt is my aunt. Cheng Jinzhou suddenly understood that this Lord Shen Cong was actually the concubine of the Shen family. No wonder there was only one person waiting on him when traveling, and the person who came after him seemed to be the legitimate son.

Although he is also the legitimate son, and although he often bullies others, Cheng Jinzhou still interjected as if he couldn't stand it: "Guys, this is the end of our conversation today, please do as you please."

His voice rose slightly, hoping that the four of them would retreat. In his opinion, the Star Warlock Association is like a high-end club. Since fighting is not allowed and it is inconvenient to quarrel, making unreasonable troubles is naturally very unsatisfactory. As for Shen Cong's housework, it is not his concern.

"Children, go away." The bone-slapping man said angrily. He is three or four years older than Cheng Jinzhou, just like a college student looking at a junior high school student.

"The one in the middle is Shen Yanqi, and the ones behind are Shen Zhe, Shen Hua and Zhang Ruitao." Shen Cong said to Cheng Jinzhou.

The three Shen family members may all be legitimate sons. Cheng Jinzhou didn't want to offend too much, so he stood up and said, "Shen Cong, let's go inside and read a book and wait for a response."

The four of them were stunned for a moment, then burst into laughter, causing several tables around them to turn their heads and stare. Shen Yanqi pretended to be panting, patted his forehead with his fan and said: "Oh, country nobles are so funny, the association's library Is it because you can come in whenever you want?"

As he spoke, he turned his head and said, "I heard today that my aunt left with a new kid who entered school. I guess she's talking about you."

"That's right." Listening to his words, it was known that he also went to Hongwen Hall. This was not surprising. The really strange thing was that Shen Cong had difficulty entering Hongwen Hall as a concubine.

"Where's the Star Warlock with you?"

Cheng Jinzhou shook his head in confusion, feeling rather fed up with the current situation. He has a new mental arithmetic tutorial, and he has mathematical knowledge that is hundreds of years ahead of others. Except for the lack of a star formation that can directly use this knowledge, he is not much worse than a real star warlock. But being entangled with a few "little kids" here, I felt a little unhappy, so I simply pulled Shen Cong up, pointed at the stone door and said, "Let's go in."

This is a branch of the Star Warlock Association. It must be related to mathematics and science, so he is naturally not timid.

Shen Yanqi and others looked at it with their arms crossed, pretending to be watching a good show.

Cheng Jinzhou took the lead, crossed the two rows of round tables, and then asked Shen Cong in a low voice: "What do you want when you enter the stone gate?"

"You don't know?" Shen Cong looked like he was about to faint.

"nonsense."

"If you have contribution points, you will get a certification stone. As long as you have one stone, you can take the two of us in." Shen Cong reported the last glimmer of hope.

Cheng Jinzhou slapped his forehead and said, "I'm not wearing the certification stone."

When he got 4 contribution points that day, Warlock Liu Kuangxing gave him a certification stone.

Shen Cong almost felt like he was on the verge of death, and immediately whispered: "Really? If there is a certification stone, there will be a record. Give it a try."

Not far away, Shen Yanqi, who was watching the show, was laughing when he saw Cheng Jinzhou and Shen Cong passing through the stone gate without any hindrance.

The smiles of the four people suddenly solidified.

…

In addition to the word count: It will be on the shelves today. Thank you readers for subscribing. If you like it, please vote for this book. This will be the greatest encouragement to Shitori.

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