The number of chapters is wrong. The content continues from the previous chapter.

Shen Kuo is definitely a well-known figure in the history of Chinese science, who has deep attainments in mathematics, geography, chemistry, biology, medicine, engineering technology, etc., and has a considerable amount of scientific knowledge, and is the author of well-known scientific masterpieces at home and abroad such as "Mengxi Writings".

Zhezongqi said: "Yes, what's wrong?". While saying that he was still in his hand, he continued to calculate with his calculation chips.

"What about others?"

"Why are you asking this?

"I'd like to meet you, the god operator."

Zhezong smiled: "That's too unfortunate, when he was in the battle of Yongle City, the army he led was defeated by Western Xia, so he was demoted by his father's decree." Let him edit the map of Tianxia Prefecture and County. ”

"Huh?" Du Wenhao only knows now. It turned out that Shen Kuo also participated in the Yongle City of Western Xia.

Such a great scientist couldn't see it, Du Wenhao was a little stunned.

Zhezong smiled: "General Shen, I'm almost done." You haven't done it yet, you're doomed! ”

Du Wenhao smiled and said, "Okay, I'll catch you up now, speed up!" "Say it. After walking slowly back to the table, he picked up his pen and began to calculate the multiplication arithmetic problem.

Using Arabic numerals and simple addition, subtraction, multiplication and division symbols, this kind of problem is calculated using multiplication formulas. That's a lot faster than using a chip. Therefore, Du Wenhao only took a moment to calculate this question and check it step by step. After confirming that it was correct, he put the brush on the pen holder and glanced at the four below, still fiddling with the chips. Especially Zhezong, his fingers are running like flying, arranging flowers and plugging willows, and the calculation of chips alone is indeed amazing.

Du Wenxuan walked up to him with his hands behind his back: "How is it?" Emperor. Is it settled? ”

"Don't mess around! Right away". At the last moment, Zhezong didn't dare to be distracted, and he didn't even raise his head. He frowned and continued to count.

Du Wenhaodong looked at them one by one with his hands behind his back, Zhao Wei held the calculation chip with a bitter face, and slowly put the little fat man Zhao was still sweating profusely. When she came to Princess Niannian of Xu Kingdom, she also put down the calculation plan with a sad face, and picked it up again after a while, hesitating. Apparently something went wrong with the calculation.

Du Wenhao lowered his head and told her the answer in a low voice in his ear. She turned to look at Du Wenhao sideways, and nodded in surprise and joy.

Du Wenhao earned another lap, returned to his seat and sat down, holding a teacup and sipping tea slowly. Zhezong looked up at him with a look of surprise: "Are you done?" ”

"It's long over! How long does it take for such a simple question to take so long? Alas! ”

"Simple? Hum! Don't brag! ”

"Whether it's bragging or not, the emperor will find out later."

Zhezong lowered his head again and continued to fiddle with the calculations, and after a while, he finally shouted, "It's calculated!" He turned his head to take a look, and saw Nian Nian sitting there, so he asked, "Hey, with the fart, have you figured it out?" ”

"You've figured it out a long time ago, you're a fart!"

"Lian doesn't believe it, show it to Lian!" Let's talk about it. Walked over from the next position, took the paper in Nian Nian's hand and glanced at it, and was surprised: "Impossible!" It's not bad if you can calculate such a complex problem, and it can't be faster than the joint calculation! ”

"I'll figure it out, how's that! Hee-hee"

Zhezong turned his face and glanced at Du Wenhao: "Just now, Lian saw General Du sneaking next to you and saying something, he must have told you the answer, right, how could he figure out the answer so quickly?" ”

Zhezong walked over quickly, picked up the piece of paper on Du Wenhao's table and looked at it, and sure enough, the answer was the same as his own! Exclaimed, "Won't it? You don't even have to do the math? Calculated by heart? ”

"No, don't you see that I have the calculation process written on it?"

Zhezong looked up and saw all kinds of strange symbols written crookedly on it, and he couldn't understand what it was, and asked, "What are you?"

"Arabic numerals, multiplication formulas. Hey hey"

"What?"

"It's just a special symbol for calculation, it's much simpler than your calculation, isn't it?"

Where is Zhezong willing to believe it, he turned his head to stare at Fu Yaoyu, and said viciously: "You shrug him to cheat?" Told him the question beforehand, didn't you? ”

Fu Yaoyu hurriedly knelt down to kowtow: "No, your majesty, Weichen will never dare to commit this crime of bullying the king." This question was indeed improvised by Wei Chen just now. General Du was not told. ”

"Believe it or not!"

Du Wenhao said coldly: "If you don't believe it, so let's do it, you come up with a question yourself, and let's compare it again." ”

"Good". Zhezong thought for a moment and said a two-six-digit multiplication problem. And then it was as fast as a shuttle and calculated.

This time, Du Wenhao deliberately frustrated his spirit, picked up the pen, and quickly calculated it, checked it, wrote down the answer, and put it upside down on the table. Clapped his hands: "I'm done!" ”

Zhezong was dumbfounded: "Impossible! ”

"Emperor" Du Wenhao took a sip of tea slowly. "Anything is possible!"

"Your answer is definitely wrong. I'll talk about it when I figure it out! Zhezong ignored him, and continued to calculate with a dark face, at this time, Zhao Ying and Zhao Yi had already stopped and came over to see the excitement

The more anxious Zhezong became, the slower he became, and this time it took almost a stick of incense to figure it out, and he took Du Wenhao's paper and looked at the answer, and it was still the same. Stunned.

This time it was a question that Zhezong himself came up with on the spot, and it was absolutely impossible to cheat. Only then did he believe that Du Wenhao's calculation method was really godly, put down the paper in his hand, nodded and said, "Well, your arithmetic is very powerful, but." Lian wondered, what exactly is the use of arithmetic? ”

"A lot of practical problems can be solved." Du Wenhao said: "For example, the granary of a certain yamen is cylindrical, and there are seventy hums in total" Each size is the same, the diameter of the bottom of the silo is two zhang, and the height is one zhang and five feet, ask how many stone rice can be held in these seventy granaries? ”

Zhezong had never studied geometry at all, and he didn't know how to calculate the volume of a cylinder, so he shook his head blankly: "What else can I teach the union, sir?" ”

Du Wenhao took half a glass of water, put it on the table, took a brush from the pen holder, inserted it into the water upside down, and put it in front of Zunzong and the other four children: "Can anyone tell me why the pen in the quilt looks crooked?" ”

This phenomenon is very common, and they have known about it for a long time. However, to explain why it was crooked, he couldn't say it, and looked at him and shook his head.

Du Wenhao said: "This is the refraction of light. When I tell you about the light, you will understand. ”

Du Wenhao took an empty cup. He said, "Suppose the emperor is going to make such a cup out of gold. How much gold is required? ”

Zhezong and the other three were naturally shaken again.

Du Wenhao then asked in one breath: "Who knows why the earthquake happened?" Why does it rain? Why does thunder and lightning occur? Why does the sun always rise in the east and set in the west? Why is there a tengu eclipse moon? Why is the moon cloudy? Why do stars blink? Who are we? Where do we come from? Where to go? Where are the five internal organs of the human being located, and what are their functions? In addition to our Great Song Dynasty, Great Liao, and Western Xia, what other countries are there in the world? Where are they all? How can I get to them,,? ”

The four of them shook their heads in a daze.

Du Wenhao smiled and said: "These, you will know these after listening to my lectures." ”

The little girl clapped and said, "Yes! I want to hear from him now! ”

Zhao still grinned, and his chubby face was full of smiles: "Yes, it sounds so tempting!" I'd love to hear it too. ”

Zhezong listened to the two of them drooling and looked excited. In fact, my heart was also itchy, and I smiled: "Mr. Du's class is indeed very attractive." Unexpectedly, Mr. Du is well-read and knows so many things, no wonder the imperial grandmother wants you to be in charge of the study of the Union

Du Wenhao smiled, and saw Zhao Wei sitting there in a blink of an eye, not as excited as the other three. Unconsciously surprised, he asked, "Eleventh Prince." What's wrong? ”

"Can you teach me how to draw?" Zhao Wei asked.

Only then did Du Wenhao remember that this suave emperor was a great painter with a wonderful brush, and what he was most interested in was painting. It's not good to paint on your own, what should I do?

He rolled his eyes and immediately had an idea. Didn't he learn sketching, although the technique is not yet on the table, but at least I can teach him some perspective knowledge and some brilliance knowledge. Because traditional Chinese painting does not pay attention to perspective, let alone the glorious effect. You can teach him about it yourself. However, there is one thing to note here. That is, you can't use the knowledge of brilliance in portraits, otherwise you will get into trouble.

There was a little story about this in history. During the Qing Dynasty, there was once a Western painter who wanted to show himself in front of Lafayette and painted a portrait of Lafayette Cixi. He used the glorious effect of Western painting to paint Cixi Lafayette very realistically and three-dimensionally. But. When the painting was sent to Cixi, Lafayette was furious and almost pushed him out to behead, because in Lafayette's eyes? This so-called three-dimensional effect with shadows on the face is a kind of obscurity that the Chinese are very taboo about "yin and yang face". Frightened, the Western painter quickly changed his mind. Changing Lafayette's face to a flat piece of sunshine, Lafayette turned anger into joy, which spared his life.

Du Wenhao smiled and said to Zhao: "I don't know how to use a brush to draw landscapes, flowers and birds, but." I can teach you how to draw with charcoal, and I can also tell you some proper painting knowledge. It can make your drawings more realistic. ”

"Really? Zhao estimated

The other three also shouted for Du Wenhao to immediately start teaching them the knowledge they had just mentioned.

Du Wenhao said: "It's too late now. I'm going to the Prime Minister's Mansion for a meeting soon, and in the afternoon the two attendants will give the emperor and the three of you an inspection of what you've learned before, tomorrow. Tomorrow I will teach you. ”

He told the two old masters a few words, and after asking them to investigate the questions, he left the Zishan Hall with his hands behind his back and came to the Prime Minister's Mansion Political Affairs Hall.