Why is Chen describing Gan Le with the root number 3?

This sentence was originally said when Teijin and Chen Zhenggang met (when Teijin first arrived in Ikebukuro), which means that such a sentence is too difficult for even primary school students who don't understand the square root.

The original novel fragment is like this (I bought a Chinese translation):

The person you just said should not be provoked, although it sounds like the plot in a comic book, what kind of person is it? (Teijin)

When a young man with a tender face asked in a naive tone, the priest looked up at the sky as if he thought of something, and finally made up his mind to say, "The first one is me!" " "

"... root number 3 points"

"Root number! ? What's the root number? ? If you want to spit, at least give a negative 20 points or something, which is easier to understand! Never ... are you trying to say that my stalk is so difficult that even primary school students who don't know the square root can't understand it? ? Good boy, as soon as I finished, you came to spit on me! When did your understanding become so poor? Is it open education? Did open education make you like this? ? "

"It turns out that open education still has this deficiency."

In the novel, the part of the minister Tucao Yelin (Gan Le) is like this:

Good night (Tanaka Taro Teijin)

(Ann ~) (Selti, Seton)

{Good night} (Singing in the Apricot)

Ah, is there anyone new here?

"Hello,"

"Meet for the first time. I am Bajula. " (Bajula, Chen Zheng)

Meet for the first time ~

"I was invited in by Gan Le ~"

{That's right}

Yes, we met online. So is Bajula. )

"No, it's a practical understanding."

"It's like the relationship between working partners! Although this is to show ... ah! " (Gan Le Yelin)

"When will Gan Le die?"

"Surprisingly practice strict vomiting! ? 》

{I don't think I can stand dying}

"Sorry,"

"Gan Le made me a little unhappy and blurted it out."

"This is not even pride."

(Next, there is a whisper between Teijin and Chen Zheng. Teijin found that Bachula was Chen Zhengren, but Chen Zheng didn't say anything. )

On the other hand, I think it is a relationship that can be met in real life, so please let everyone know my charm by Bajiula! 》

"That's right."

"For example,"

"Using numbers to represent Gan Le is-"

"The root number is 3 points."

What does the root symbol mean? )

"Hey? Does that mean I'm too beautiful to drive? 》

"Primary school students are too difficult. Don't show them a better meaning. "

"ah! ? I don't know whether you are praising me or laughing at me! ? 》

"Oh, I'm sorry, I'm going to cancel here today-"

(ok ~)

"Thank you! 》

{Thank you very much}

That, Bajula!

Come again! I welcome you very much!

"I will come again, so goodbye!"

(good night ~)

Good night~

……………………………………

That's all. The dialogue is typed by the book, and the brackets behind the dialogue are the speakers. I hope I can't understand it and it won't make you impatient (laughs). I haven't looked back for a while, so some people don't remember DRRR! ! Mwzlj has time to review whether the dialogue of Teijin Chen Zheng and the explanation of the root number 3 appear in the first sentence of the animation.