Otaku Engineer in Great Tang Dynasty

In the office.

Hearing Liu Hongyuan's question about the principle of equal chance, Li Zexuan couldn't help but rubbed his eyebrows, because this question was too complicated to explain! After thinking about it for a long time, he still didn't know where to start, so he could only say:

"Dr. Liu, these so-called opportunities are equal. It is difficult for juniors to explain to you for a while. In the future, arithmetic will derive another subject called "Probability Theory and Mathematical Statistics". After you read that book, roughly You will understand what equal opportunity is. In addition, when mathematics develops to the advanced stage, the same result can be calculated through the method of pure mathematics. That method is more complicated, and the younger generations will not use it!"

In fact, the problem of Buffon's needle throwing can be proved by pure mathematics. Two mathematical abstractions are used in the middle. First, let the midpoint of the needle rotate around a certain point on the basic unit line segment, and integrate the ratio of the two areas. Then let the needle move on the line segment of the basic unit, and use definite integral to get the ratio of the two volumes, and finally get the relationship between the probability of the thin needle line pressure and π.

However, knowledge of trigonometric functions and calculus is needed in this process, and it will be even more troublesome to explain!

But then again, when a person reaches that height in mathematics, he will not use the "stupid" method of needle-throwing experiment to find the pi! Because of the trigonometric function plus the infinite series method, you can get a more accurate pi.

According to records, the British mathematician Machin used the formula in 1706: π=16arctan(1/5)—4arctan(1/239) to calculate the value of π, breaking the 100-digit mark. The value of arctanx can pass the Taylor class. Count it out.

At this moment, Liu Hongyuan couldn't help but be surprised. Hearing what Li Zexuan said, everyone feels that the very advanced new arithmetic is just in its infancy. There will be a whole set of advanced theories in the future, and it will be derived. Learn other things!

How old is Li Zexuan this year? How can there be such a terrifying amount of knowledge in your mind? Is he going to stand on his own and become a leading figure in mathematics?

At this moment, Liu Hongyuan couldn't care about pursuing the "principle of equal opportunities". There was only horror in his heart. The look in Li Zexuan's eyes was just like a monster!

"Gudong~!"

It was Xu Hongzhi who was stunned for a while and couldn't help but swallow a spit, thinking that when he first met Li Zexuan (when the store was checking the accounts), he wanted to give him some pointers! He only knew today that he and Li Zexuan were not on the same level at all, and could be described as the difference between heaven and earth.

"Shanchang, you have already mastered all the advanced stages of mathematics you mentioned?"

Xu Hongzhi came back to his senses and asked tentatively.

Li Zexuan tilted his head and thought for a while, and said, "Seven or eighty percent! When I didn't want to learn, I learned seven or eighty percent!"

What he said is the truth. When he was in high school and university, his mathematics scores were not outstanding, at best it was excellent, not as good as those who could get full marks every time!

However, in this life he has such a strong spirit, and if he is given another chance, he will definitely be able to compare to those high school tyrants in his class.

"Puff~!"

Xu Hongzhi and Liu Hongyuan almost vomited blood. First, they were depressed. Li Zexuan was only able to "sling" the two of them after only 70% to 80% of his studies. Second, he was angry, because Li Zexuan had such conditions to learn such knowledge. Learning is really violent!

"Then Yonganhou's current arithmetic attainments, can the ancestor rate be calculated to more than seven decimal places?"

After struggling for a long time, Liu Hongyuan asked such a question. He mainly wanted to see whether advanced mathematics was as powerful as Li Zexuan said, not to deliberately embarrass it.

Li Zexuan laughed secretly in his heart, and now he can "pretend to be forced" again, because he deliberately carried this thing in his previous life to "pretend to be forced", but until his "accidental death", no one gave him a chance to "pretend". Lao Liu simply came to "send him a pillow"!

"Haha! Of course! The kid has spare time, forget it a few times, now read it out and share it with the two gentlemen, two and listen carefully!"

Li Zexuan chuckled, then stood up, stood with his hand held, and started the pretense mode: "Three points, one four, one five, nine, two six, five, three, five, eight, nine, seven, nine, three, two, three, eight, four, six, two, six, Four three three eight three............"

Originally, Liu Hongyuan was just a random trial, but Li Zexuan couldn’t stop at all when he spoke. In a blink of an eye, he reckoned to the eighth, nine, and tenth decimal places, which had exceeded the accuracy of the ancestral rate obtained by Zu Chongzhi, but Li Zexuan still did not. stop.

"...Three seven five one zero, five eight two zero nine, seven four nine four four..."

Listening, Liu Hongyuan and Xu Hongzhi seemed to have heard something wrong. Although Li Zexuan's speech was very fast, they still heard Li Zexuan as if reading numbers according to a certain rhythm.

Yes, it is rhythm!

The two couldn't help but stare at each other, they somewhat suspected that Li Zexuan was thinking.

"... Three forty eight, two five, three four two one one, seven zero six seven nine! Phew, okay, the juniors only remember the first 100 for the time being, the two gentlemen can write it down for later verification There is absolutely no mistake in the top 100. I, Li Zexuan, pledged my personality!"

After reading for a while, Li Zexuan finally stopped. He let out a soft breath and said to the two in front of him.

The reason why he was able to memorize the top 100 of Pi in his previous life was mainly through a speculative approach:

Imagine a drunkard drinking in a mountain temple, drunk to death in the ravine:

"One temple on the top of the mountain, one pot of wine (3.14159), Erle (26), my three pots are not enough to eat (535897), and the wine kills you (932)! Can't kill (384), happy and happy (626). That's it (43383), Erqigou (279)." [Top 30]

Next, imagine the feelings of the father of the "dead" when he learns of his son's death:

"My painful son (502), death in vain is sad enough (8841971), leaving it to Shangougou (69399)." [15th]

Imagine the "dead" father looking for his son in the valley:

"I have low back pain (37510), I am afraid that you will be cold for a long time (58209), and I will think about miserable things for a long time (74944)." [15 people]

Then, it was the father who found his son in the ravine and rescued him. The son knew when he was lost:

"I save my children (592), caves (307), not to stay (816). Neighbors are happy (406), children are not happy (286), children love my dad for a long time (20899). My dad does not understand pleasure (86280). 'Think twice (348)!' Erwu (25). Think twice before Yiyi (34211), and wait for his wife to enjoy his happiness (70679)." [Last 40]

That’s it~www.readwn.com~ Isn’t the top 100 of Pi a good memorial?

(Ha, just ask you 6 no 6)

Not slipping away, Xu Hongzhi and Liu Hongyuan didn’t know, but when they heard Li Zexuan packing up the tickets so solemnly, their expressions became solemn, because Li Zexuan never guaranteed anything with his personality, which is basically the same. Yu Zhitian swears (cough, ancient people did not know the slogan "I use my personality to guarantee")! Immediately afterwards, the solemnity on their faces turned into horror. If what Li Zexuan said was true, it would be too scary! Zu rate one hundred digits after the decimal point, this, Li Zexuan, this is the **** who wants to break the academia!

Seeing the deep shock on the faces of the two, Li Zexuan couldn't help feeling a little proud, and finally pretended to have a big comparison! But Xu Hongzhi's next sentence made his face suddenly black.

"Ahem, Shanchang, can you read it again, let's take notes!"

…………………

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