future library.

Chapter 71

The surprises brought to Cheng Jinzhou by the elementary mental arithmetic course are far more than just calculation ability.

In fact, speaking of fast calculation methods, Chinese abacus mental arithmetic simulates the abacus in the brain, and can achieve the level of writing answers while speaking questions, but such a quick calculation method often requires long-term practice.

In the land of the Great Xia 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 Course" is not as simple as a simple calculation method.Cheng Jinzhou read it in order, and immediately discovered several new practical formulas, a new calculation method for angles and distances, greatly simplified the corresponding calculation process, and added a quick calculation method-this is definitely not a textbook at the level of the 21st century. This judgment made him turn the book faster.

Cheng Jinzhou's surprise contrasted with Shen Cong's depression.Xiao Shen was completely in the mood of seeking novelty. He ran with a 13-year-old child for two full hours in order to see the novelty. In the end, he only saw boiling sulfuric acid water—the scene of hot sulfuric acid bursting violently. It was indeed very interesting, but the time was too short. What made Shen Cong especially dissatisfied was that Cheng Jinzhou, who he thought would reap the benefits of his younger brother, did not show his talents to the boss and bowed down.

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

Xiao Cheng didn't explain a word, just 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."

"Then let's go." 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 eyelids and let him guess.

The unexpected Star Array and the unpredictable attitude bluffed student Shen Cong for a while. In school, anyone who can use the Star Array, regardless of grade or not, is very stylish. Meeting a new classmate With this method, Shen Cong also became quiet.

While sitting in the car, Cheng Jinzhou devoted himself to studying the newly acquired mental arithmetic tutorial.

Mathematics has always been a process from simple to complex and back to simple.For example, the simplest type of cubic equation that junior high school students need to learn now, that is, the cubic equation without quadratic terms (the cubic equation without the square of X), the simple answer can be recited in 2 seconds. In the 16th century At that time, the Italians regarded it as the existence of martial arts cheats.This is also a famous koan in the history of mathematics. At that time, Ferlo, a mathematics professor at the University of Bologna in Italy, successfully solved this type of equation that is 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 Fior. Twenty years later, another self-taught Italian, Tartaglia, publicly declared that he had mastered the more difficult method of solving cubic equations (equations that contain quadratic terms but not linear terms). Upon hearing this news, Professor Fior, his apprentice, challenged Tartaglia, like a martial arts master, and the two agreed to solve 20 similar equations within 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 Math Olympiad students, and a large number of middle school students could abuse them at will, because we have already mastered More general solutions to cubic equations, fewer calculation formulas, less memory, faster and more accurate answers, sufficient research in modern mathematics, not only simplify the calculation process, but also simplify the way of thinking - mathematicians use Jerky formulas study problems, but in the end ordinary people have to use them.

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

Cheng Jinzhou's eyes almost turned the ring, which made Shen Cong who was sitting next to him very uneasy. When he was about to reach the place, 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 like reciting.

He really needs some capital to settle down in the Great Xia Dynasty.If it is said that Cheng Jinzhou, who was in a wealthy family, still shy away from maintaining the status quo when he first arrived, the actions of Cheng Bingxun and his son made him fully understand that he no longer has the care of his wings.

Walking on the bustling streets of the capital, the Cheng family gave him only the most basic protection - the right to be a free man, other than that, he was required to fight.

In fact, from childhood to adulthood, Cheng Jinzhou really rarely had to fight against anything.

Shen Cong became more depressed. Seeing that he was stabbed again by the city guard in front of the second gate, he sat up immediately, patted Cheng Jinzhou on the shoulder and said, "You are not catching ghosts, but you were caught by ghosts, right?"

The small body couldn't help the heavy blow, Xiao Cheng jumped up with a "squeak", and said in a huff, "What do you want to know?"

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

Cheng Jinzhou said truthfully: "The star array is useless."

"You lied to me."

"The star array is really useless."

"impossible."

When the soil of crime is lost, there will be no crime in the world, and the same principle can be used for honesty.

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

……

The gate just south of Xiajing's inner city is called Mingde Gate.

Within 200 meters of the city gate, there are no buildings, forming a small area like a square, which is a playground for many children.A little to the north, the market suddenly became bustling, and at the end of Cross Street, a round building stood in it, and there were two imperial guards standing guard at the gate with spears.

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

The gate of the Xiajing branch 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 family badge on his belt, and then beckoned to Cheng Jinzhou. At this moment, he made a move again, pulled Xiao Cheng and said, "Don't run around here, I'll take care of you if something goes wrong." Can't save you."

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

From the outside to the inside, the association looks like a Chinese coffee shop plus a library.Many people sat around the round table talking, and the waiters shuttled among them. A few hundred square meters away was a stone door, inside which was a two-story wooden shelf filled with books.In contrast, the people outside Shimen are overcrowded, but the people inside Shimen are pitifully few.Many people looked inside like Cheng Jinzhou, but no one came in or out.

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

"Is that all right?" Cheng Jinzhou noticed his movements and asked puzzledly.

"Could you expect the astromancer to greet you in person?" Shen Cong snorted.

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

Hearing the word "Little Aunt", Shen Cong's expression changed, and he stood up with a "Hula", and the bench was kicked away.

Cheng Jinzhou looked intently, but there were four teenagers in white robes holding fans. They were about the same age as Shen Cong, with more greasy hair and more powdered noodles.

Naturally, no one is allowed to bring people in from the branch of the association. Shen Cong is not tall, standing by the table, he looks a little lonely.

"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 didn't say anything. The laughing and cursing among noble children was often not that simple, and the young people's hands were even more indifferent. He couldn't beat the other four, so he just stared at him with his neck stuck.

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

The little aunt is the aunt.Cheng Jinzhou immediately understood that this His Excellency Shen Cong turned out to be the son of the Shen family, no wonder there was only one person to serve him when he went out, and the later one seemed to be the son of the son.

Even though he is also a legitimate son, although he often bullies others, Cheng Jinzhou still interjected as if he couldn't get used to it: "Several, this is the end of today's chat, please go ahead."

His voice raised slightly, hoping that the four of them would retreat in the face of difficulties.In his view, the Astrology Association is like a high-end club. Since fighting is not allowed and it is inconvenient to quarrel, making trouble for no reason is naturally very unnutritive. As for Shen Cong's housework, it is not his concern.

"Kids go away." The fan bone 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 members of the Shen family 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, and then laughed, causing the surrounding tables to turn their heads to look away. Shen Yanqi pretended to be panting, patted his forehead with a fan and said: "Oh, the country nobles are so funny, the association's library Is it also you who want to enter?"

As he spoke, he turned his head and said, "I heard today that my aunt went with a new kid who entered school, so it must be you."

"That's right." Listening to him, one knew that he was also studying in the Hongwen Hall, which was not surprising, but the really strange thing was Shen Cong, who found it difficult to enter the Hongwen Hall as a bastard.

"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 the branch of the Astromancer Association, and the entrance must have something to do with mathematics, so he is naturally not afraid.

Shen Yanqi and the others looked at it with arms folded, pretending to be watching the show.

Cheng Jinzhou took the lead, passed two rows of round tables, and asked Shen Cong in a low voice, "What do you want to enter Shimen?"

"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 had the feeling of surviving death, and immediately whispered: "Really? If there is an authentication stone, there will be a record. Try it."

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

The smiles of the four people suddenly solidified.

……

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(End of this chapter)