When I first saw Huang Chengyan, I couldn't help but startle Lu Bu, damn, is this called Huazi?

I saw that Huang Chengyan's clothes were black, there were burned holes everywhere, his hair was messy, and his face was so black that he couldn't see his appearance.

The whole image of an African refugee.

Lu Bu couldn't help but ask speechlessly, "Mr. Chengyan, what are you doing here?" ”

Huang Chengyan didn't pay attention to Lu Bu's stubble at all, pulled Lu Bu to a pile of finished steel, and said to Lu Bu: "You see, this is the steel I made based on the materials you provided. ”

"The proportion of carbon mixed in these steels is different, and the hardness and flexibility of the steel that come out are very different, you see, this is the data I recorded."

Then Huang Chengyan pulled Lu Bu to introduce the characteristics of these steels to Lu Bu, and actually said that Lu Bu's head was too big, and Lu Bu found that he didn't understand it......

Well, tech maniacs deserve to be tech maniacs.

I just gave Huang Chengyan an idea, but Huang Chengyan quickly studied it, and he really made a lot of money if he could find such a talent.

After Huang Chengyan finished a paragraph, Lu Bu hurriedly interrupted Huang Chengyan's words and proposed to Huang Chengyan to make a mold, and Huang Chengyan was really moved.

The concept of mold is definitely a huge innovation and breakthrough in the smelting industry, which is bound to change the pattern and status quo of the smelting industry.

Huang Chengyan had a great interest in molds, and after listening to Lu Bu's suggestions on mold making and the materials needed for molds, Huang Chengyan immediately devoted himself to research.

Seeing this situation, Lu Bu couldn't help but shake his head.

This Huang Chengyan is really a workaholic.

However, molds are too important, with molds, not only can you build weapons, including farm tools, etc., you can also build.

If agricultural tools are improved and water conservancy facilities are built, agricultural output will be greatly improved.

……

Coming out of the steel mill, Lu Bu saw Huang Yueying squatting on the ground, with a thoughtful look on her little face.

Seeing Lu Bu coming out of it, Huang Yueying jumped up to meet him and asked Lu Bu, "Brother Lu, did the centurion walk two hundred and forty-one zhang?" Well, maybe a little more than two hundred and forty-one zhang. ”

Lu Bu looked at Huang Yueying with a shocked face, speechless for a long time.

Wicked, really wicked!

This question is really too difficult for people in this era, and Lu Budu wondered how Huang Yueying calculated it.

Seeing Lu Bu's surprised appearance, Huang Yueying asked shyly, "Brother Lu, did people miscalculate?" ”

Lu Bu shook his head and said, "No, Yueying, you tell Brother Lu, how did you figure it out?" You can figure out such a difficult topic, you are so powerful, and now Brother Lu is beginning to admire you. ”

Huang Yueying said shyly: "Brother Lu, actually, in fact, this number was made up by others, can Brother Lu tell me how this question is calculated?" ”

Lu Bu said happily: "Of course you can, let's go, let's go home, I'll tell you the algorithm of this problem!" ”

After speaking, Lu Bu walked back with Huang Yueying's small hand.

Being held by Lu Bu's hand, Huang Yueying was indescribably happy, bouncing up and down beside Lu Bu, light as a little butterfly.

After returning home, Lu Bu found a pen and paper and began to explain to Huang Yueying the solution to this problem.

Lu Bu first drew a figure on the paper with a pen, and then marked the numbers on it, but as soon as he talked about it, he got stuck.

Huang Yueying looked at the numbers written by Lu Bu and asked, "Brother Lu, what do you mean by writing this zigzag?" ”

Well, Lu Bu really wants to say that this is an Arabic numeral, but the Eastern Han Dynasty has not passed it over yet.

Well, if you want to explain this topic, let's explain Arabic numerals to this little girl first.

Lu Bu wrote ten Arabic numerals from 0 to 10 on the paper, and then said to Huang Yueying: "Yueying, I found that it was particularly troublesome to write Chinese characters when calculating, so I replaced Chinese characters with these ten symbols. You see, this is one, this is two, this is three...... This is ten. ”

Next, Lu Bu explained to Huang Yueying how to write numbers such as ten or even one hundred and ten thousand.

After the explanation was completed, Huang Yueying's eyes couldn't help but light up, and she nodded and said, "Wow, Brother Lu, you are so amazing!" After using this symbol, it is much more convenient, and I don't know how much faster the calculation speed is! ”

……

Huang Yueying is very smart, and she quickly memorized all the Arabic numerals.

Next, Lu Bu continued: "Let's assume that the speed of the team is V1, and the speed of the centurion is V2......"

Then Huang Yueying asked again: "Brother Lu, what is the speed?" What are V1 and V2? ”

Well, well, this unknown problem needs to be explained anew.

In the back, as for the equal sign, multiplication, division and open square, each noun needs to be patiently explained by Lu Bu.

However, Huang Yueying's receptivity is really strong, if it were replaced by other children, I am afraid that she would have been dizzy by so much new knowledge, where can she still understand what Lu Bu said.

But Huang Yueying not only understood, but also absorbed all this knowledge and completely mastered it.

This understanding is really very rebellious, and it shocked Lu Bu.

You must know that Lu Bu accepted these things, but it took more than ten days to memorize them.

After this explanation, Lu Bu found that it was dinner time, so he took Huang Yueying's little hand and went out to eat.

Huang Yueying said excitedly: "Brother Lu, I found that after listening to the topic you explained today, a door seemed to open in front of me. Brother Lu, did you come up with these? You're really amazing! ”

Ahem, I'm not really good at all, I'm just standing on the shoulders of giants......

Lu Bu said step by step: "Yueying, in fact, there are a lot of interesting and interesting places in mathematics. For example, when measuring land, if the land is trapezoidal, how do you calculate its area? It's the number of acres. ”

"What if it's a rectangle? What about the circle? What about the oval? What about triangles? Also How do you calculate how much water a pond can hold? How much water can a bucket hold? And so on, there's a lot of interesting stuff! ”

Huang Yueying couldn't help but ask Lu Bu with a twinkle in her eyes, "Brother Lu, can you teach me all this knowledge?" The things you explain are really amazing! ”

Lu Bu laughed and said, "Of course, I have made a book of these math problems, and I will show them to you after dinner." ”

Huang Yueying couldn't help shaking Lu Bu's hand and said, "Brother Lu, you can take it now, people want to see it now." ”

Lu Bu laughed and said, "Okay, you wait, I'll go get it for you." ”

With that, Lu Bu returned to the study, took out two books, and handed them to Huang Yueying.

These two books were excerpted by Lu Bu from modern primary and junior high school textbooks, and as for the more advanced ones, they are not needed for the time being.