Ruler gauge drawing, complete a regular seventeen-sided shape!

Before the others could say anything, Cheng Jinzhou was stunned on the spot.

Using the doctor's title he got through the back door, this kind of topic is definitely not something that the old lady came up with herself.

Don't think it's easy to make a regular heptan, it was a world-class problem before the 18th century, and it was quite a meaningful one.

These days, Cheng Jinzhou is reading books about geometry every day, although there are not many books about this kind at home, but he can also learn about the mathematical level of the world from the side.

It may be able to reach the level of the early sixteenth century in Europe, and in some respects it may still be able to go beyond it, but the study of how to make a regular heptanacean is beyond the limits of the epoch in a certain sense.

The so-called ruler drawing is a way to make a figure by using a ruler and compass without a scale only a limited number of times. The finite number mentioned here is to eliminate the use of the trial method.

This is a seemingly simple proposition, but it is actually a complex proposition. In fact, in the history of Cheng Jinzhou, this proposition was finally solved by Gauss, another brilliant mathematician, who made countless contributions in his lifetime, such as least squares that was a headache for science and engineering students, and the normal distribution curve that he often came into contact with liberal arts students. Perhaps the most familiar thing about the wisdom of His Excellency Gauss is the calculation he completed at the age of 10 or 9: 1+2+3+......+1oo.

In the 21st century, children who have been exposed to the Olympiad may not know Gauss, but when you ask "how much is added from 1 to 1oo", most people may not even need to count, and they will look up and answer: "5o5o".

Gauss began to study the solution of the regular seventeen-sided shape from the time he entered the university, and how long did it take, Cheng Jinzhou had long forgotten about it, but naturally it was longer than 2o minutes, in other words, unless the mathematical level of the star warlocks of the Great Xia Dynasty advanced for more than 1oo years, it was absolutely impossible.

Mathematics is a gradual process, a real fortress in the sand, unique but never leapfrogging - a mathematical formula that is not proven in one step is wrong.

Cheng Jinzhou believed that if the astrosorcerers of the Great Xia Dynasty had been able to universally understand the diagram of the regular seventeen-sided ruler and the propositions related to it, then they would have entered the industrial society a long time ago—which was obviously impossible.

At this time, 2o minutes is meaningless, and the old lady should be ready to let the two children can't answer the question.

This is a good way, it won't be too face-saving, and it can be regarded as a safe win. The only problem is that Cheng Jinzhou is a little unhappy.

If the old lady hadn't been so shrewd and compared with a big kid in mathematics, Cheng Jinzhou would still be very, very, and confident.

Even if it is a doctor of physics produced by cheating, it will not be weaker than the high school students of the 16th century.

In fact, even if he draws a regular seventeen-sided shape, Cheng Jinzhou can undoubtedly complete it in 2o minutes.

The study of how to draw a regular seventeen-sided shape and its principle can be used as a graduation thesis for undergraduate students in the Department of Mathematics even in modern times, but using the developed method of ruler and gauge to draw is a mid-term exam for junior high school students.

The problem is that Cheng Jinzhou, in the eyes of everyone, does not seem to have the ability to transcend the times.

Dr. Cheng himself was not prepared for this.

Minutes and seconds passed.

His opponent, Cheng Jinhao, was on the table early, trying to come up with an approximation of a regular seventeen-sided shape, and at the level of a 14-year-old, he obviously didn't anticipate how difficult the problem would be - it would take 2oo years of strength from the math elite to have a chance of success. There are too many formulas, theorems and ideas, and they must be summarized by the predecessors.

Cheng Jinzhou knew, so he simply stood next to him and looked at everyone with a playful expression.

The clansmen of the Cheng family can be said to be the most educated elite group in the world, each of them has received 9 years of compulsory education in the famous Cheng family private school, but in the face of a problem of 2oo years, they are no different from the 14-year-old Cheng Jinhao.

Most people used an expression that they knew this earlier, pointing at Cheng Jinzhou and then pointing at Cheng Jinhao. Obviously, a child who is lying on his stomach is more convincing than a child who voluntarily gives up.

Cheng Jinzhou was very dissatisfied with the different expressions of the onlookers.

Especially when the black-robed people also used their eyes to locate the "Second Ancestor who doesn't work hard", Cheng Jinzhou was angry.

As a former active doctor, Cheng Jinzhou hates that people look at him as a "second ancestor who doesn't work hard", although he does cheat an infinite number of times, and he is indeed a disgraceful second ancestor......

No need to look at Cheng's mother and Cheng's father's demeanor, Cheng Jinzhou stood up very impulsively, pointed to the black robes and said, "Can you do it again?" ”

"Cheng Jinzhou!" Father Cheng was stunned for a moment, and first bluffed his face and became angry.

It's true that the black-robed ones don't even have a one-star rating, but they are people who have the potential to become a true star warlock. In places like the Great Xia Dynasty, they were also recognized as astral warlocks. Everywhere, an astral sorcerer deserves respect, at least not by a child.

Cheng Jinzhou didn't flinch from this, he has never been a very rational person, his thin fingers tapped from left to right, and said, "You have been immersed in astrology for many years, and now you can answer this question?" Who is there to laugh at me? ”

The words are a little rushed, but in terms of mathematics, Cheng Jinzhou can indeed laugh at the star warlocks enshrined by the Cheng family. He said proudly: "There is no solution to this question now, am I right?" ”

Wen Xuan's questioning made the scene quiet for a while, and the prefect Cheng didn't say anything when he saw the old lady, so he simply didn't say anything.

The star warlock who had asked the first question before continued to stroke his beard, and said disapprovingly: "In Xia Wuzong, I can't answer this question." ”

Good manners, coupled with a distinguished status, were immediately recognized by everyone, and they all said "it's okay" and had a heated discussion. This is obviously another topic that is enough to show off at the dinner table.

Cheng Jinzhou is not a fuel-efficient lamp, not before, and even less now, relying on his young age, he waved his fingers and said: "Mr. Wu, you haven't answered my question yet, not only can't you answer this question, but no star warlock can answer it, right?" ”

"This ......" Wu longitudinal stroked his beard, and for a moment he was speechless, and it seemed that it would not be easy for him to admit the failure of the Star Warlock.

Maybe it's really too young, but Cheng's father, who is old and serious, didn't stop his son and stood aside to watch his performance. As a prefect, he rarely got along with his growing son since the day he took office. I also want to see how much knowledge and how much way to deal with people have been pestering mian's sickbed all year round.

Cheng Jinzhou didn't relent, and then said to the old lady: "Grandma, I know that there is no solution to this problem at the moment, but Cheng Jinhao doesn't know, from this point of view, although both of us are not finished, I know more, don't I?" ”

Cheng Bingxun, who is kind and generous, said without hindrance, and said: "Cheng Jinhao worked hard to complete the investigation, but with a little miscellaneous learning and cleverness, you want to steal a victory from it, and you should be judged to lose." ”

The dignified son-in-law has been embarrassed to intervene in the game of the juniors, and now he is shirtless, not to mention the people of the Longzi branch, and the other Cheng family members are also a little unbearable, and someone behind him suddenly chanted: "Le Shan is good at Cheng Bingxun, Cheng Bingxun is not plucked, and the official is as clear as water Cheng Bingxun......"

A bunch of names, many of them were heard by Cheng Jinzhou, and he almost laughed out loud, but he still remembered the gift of Baqing, and only then did he rein in one or two.

The old lady didn't take Cheng Jinzhou's stubble, smiled gracefully, and said kindly: "Since neither of them answered, plus the previous question, let's go in Jinzhou, after all, it's the grandson." ”

The phrase "after all, it is a grandson" made Mr. Le Shan's face blush.

Cheng Jinhao is also a grandson, but the word is a little farther away, if it weren't for his good father, the old lady wouldn't have said this. Now, father and son can only brutally experience a hierarchical society.

With such an arrangement, Cheng Bingxun couldn't come up with a word, watching Cheng Jinzhou answer, watching Cheng Jinzhou get up and walk out, full of prayers.

A small episode, left for the Cheng family, was more of a conversation, and it quickly dispersed, leaving only the families with children, waiting to be contaminated with the joy of pulling green.

Cheng Jinzhou strode into the bright longhouse.

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