Chapter 1790: The victory of mathematics (2/2)

Xia Ruofei smiled and nodded, and said, ”Dao Master, please speak, please listen to me!”

The old true Yang said: ”There are twenty trees today, and four trees are planted in each row. Ask: How can I plant 16 rows of trees?”

Xia Ruofei was stunned when he heard the words, this time Zhenyang Old Dao really came up with a worldwide mathematical problem! However, his sixteenth row is not very challenging, because as early as the sixteenth century, mathematicians from ancient Greece, ancient Rome, and ancient Egypt completed the sixteen-row map, and it was widely used in some Western countries. Among the decorative patterns of elegant buildings.

However, Xia Ruofei thought about it, this mystery has existed for at least a few thousand years. At that time, the sixteen-line map must not have been born, so this question is very difficult. If Xia Ruofei didn't know the answer in advance, the time for a stick of incense would definitely not Come out the correct drawing.

Fortunately, Xia Ruofei usually dabbles extensively and has really seen this classic mathematical problem.

Therefore, after Xia Ruofei listened to the topic, he was determined to know that he would be able to pass this level.

He smiled and said, ”Zhenyang Daoist, can you give me paper and pen?”

The old true Yang Tao thought that Xia Ruofei needed a deduction. This is also normal. Many people can fill a room with paper to solve this problem, but it may not be able to solve it.

Therefore, it is impossible for Xia Ruofei to deduce it directly in his head, he still needs to use pen and paper.

The old true yang smiled and nodded, and motioned to Dao Tong Qingfeng to take the paper and pen, and specifically asked Qingfeng to study the ink for Xia Ruofei.

Xia Ruofei came to the table, flattened the paper on the table and pressed it with a paperweight. Then he picked up the wolf pen, dipped the ink in the inkstone, and began to draw directly on the paper.

A square soon appeared on the paper, Xia Ruofei marked the four black, and then accurately clicked two points on each side.

After Xia Ruofei entered the Golden Core Stage, his physical fitness has also been comprehensively improved, and he has strong mental power and is very good in fine control. Therefore, he didn't need a ruler at all, the square he drew was quite precise, and each line was straight, just like it was printed.

Then Xia Ruofei connected the two points on each side with the two points on the opposite side and the point away from them on the clockwise side.

There are 24 straight lines again, drawn exactly.

In this way, inside the square, an octagon has been formed.

Xia Ruofei smiled slightly, and marked each of the regular octagons formed by intersecting the inner lines of the octagon in black.

Before Zhenyang Old Dao had even reacted, Xia Ruofei leaned the brush on the inkstone, and then said with a smile: ”Zhenyang Daoist, I am done!”

The old true Yang Tao thought that Xia Ruofei was drafting and calculating, but he didn't expect that Xia Ruofei would start answering as soon as he came up, and he would complete it in such a short period of time. This is a joke!

Each question gave Xia Ruofei a stick of incense to think about and answer time, but every time Xia Ruofei came up to solve the answer without thinking, let alone a stick of incense, the first part of the three questions will also be answered. Just burned a head!

Is this done?

The old true Yang Dao was a little unbelievable, but he glanced at the map drawn by Xia Ruofei and immediately knew that Xia Ruofei had already solved this question.

Even those monks who are proficient in mathematics, when faced with this problem, usually fall into the long exam, and there are very few people who can make it in a stick of incense.

However, Xia Ruofei completed the answer in just ten seconds, and wrote the answer without hesitation, as if he could complete it without thinking at all.

”Daoist Zhenyang, am I right to answer this way?” Xia Ruofei asked.

The old true yang came back, with a wry smile on his face, and said, ”Yes...”

Xia Ruofei said with a grin: ”So, I can help you...”

”Of course!” Zhen Yang said, ”Ju Shi Xia is indeed very clever, poor Dao admires it!”

”Where is it! You are too famous!” Xia Ruofei said with a smile, ”Actually, the arrangement of these sixteen lines is not very difficult. I can also arrange a map of 18 or even 20 lines!”

”What?” The old true Yang Dao's eyes widened when he heard it, ”Jushi Xia, is this really true?”

Xia Ruofei smiled and nodded, and said, ”Of course it is true! However, in Daochang's question, only the 16-line arrangement method is required, so I answered as required.”

”Yes, yes! The poor Tao did not deny the results of Xia Jushi's answer.” Old Zhenyang said quickly, ”but if Xia Jushi doesn't mind, can you also draw the 18-line map and the 20-line map you said? come out?”

Speaking of this, the old true Yang Dao quickly added: ”This can also be counted in the answer to the last question. If the answer is better, then the gift of thanks to the layman from our Zhenyang View will be more generous! Xia Jushi, how about? Draw another picture?”

This is equivalent to adding extra points for correct answers, and no penalty for incorrect answers.

As Xia Ruofei, who has experienced nine years of compulsory education, he is already familiar with this model, so he is not surprised.

However, Xia Ruofei always didn't bother to study additional questions when he was a student.

And here today, as soon as he heard that he had drawn more lines of graphs, the thank-you gifts would be more generous, and his eyes suddenly brightened.

Obviously, that is to say, the higher the quality of the answer, the greater the reward for the final task!

How could Xia Ruofei refuse this kind of welfare delivered to his door?

What's more, this may be a difficult problem for other monks, but for Xia Ruofei, it's just a sub-question!

Because of the problem of twenty trees, in the 18th century, the mathematician Gauss had already guessed that it would be ranked 18th, but until his death, he did not come up with an official map. Until the 19th century, American interesting mathematics Lloyd completed Gauss’s conjecture and drew an eighteen-line map. By the end of the twentieth century, electronic computer technology was booming. With the help of computers, two masters successfully completed the 20-line map.

Xia Ruofei had read these two maps and remembered them in his heart.

As long as you draw a map that you have already remembered, you can get more generous rewards. Why not?