The students in the big class were all surprised, and when they looked at Leng Chan's excited look, they knew that the formula written by Li Changge must be correct.

Leng Chan looked at Li Changge and praised: "It is worthy of Li Changge who wrote "Divine Condor" and "Liao Zhai", this formula I have never seen and heard of!" You can figure it out, it's really a genius of the Shang Kingdom! ”

Li Changge said humbly: "Mr. Leng has won the award, and this formula is also obtained in the student's dream." ”

Leng Chan exclaimed: "Then you must have received the guidance of a saint!" If you are willing to learn arithmetic, you will definitely be a high-quality mathematician in the future. ”

Li Changge suddenly felt embarrassed, what he hated most in his previous life was mathematics, so forget about a high-grade mathematician or something......

But......

"Mr. Leng is a middle-grade mathematician?" Li Changge asked.

Leng Chan nodded and said, "Yes, I am a five-grade mathematician. ”

Leng Chan looked a little lonely when he said this.

Li Changge knew that if a five-grade novelist was in Shangguo, he would at least have passed the examination and could be an official, but the status of a five-grade mathematician was a little embarrassing.

can't get extraordinary abilities like a five-grade novelist, and his status is not even as good as a fourth-grade novelist.

"Changge has a few arithmetic questions, and I want to ask Mr. Leng to teach me." Li Changge said.

Leng Chan's eyes lit up, and then he said, "Please speak!" ”

The surrounding students were shocked to find that Leng Chan used the word "please", and they felt even more incredulous about Li Changge's question.

Li Changge can calculate the question, forget it, can he still solve the question?

Li Changge thought for a while, and then wrote down four questions on the paper.

"Today there are pheasants and rabbits in the same cage, there are thirty-five heads on the top, and ninety-four feet on the bottom, ask the pheasants and rabbits how much they are?"

"Now there is a beast, six heads and four legs; Fowl, four heads and two legs, seventy-six on the top and forty-six feet on the bottom. Q: What are the geometries of birds and beasts? ”

"Today there is a South China Sea, seven days to the North Sea; The wild goose starts in the North Sea, and goes to the South China Sea on the ninth day. Now the geese are rising. Ask when we will meet. ”

"Now there is a round wood, buried in the wall, I don't know the size of the saw, one inch deep, the saw road is one foot long, ask the diameter geometry?"

Leng Chan looked at the first question, his expression changed instantly, his eyes stared straight at the question, and then looked at the second question, his face became more dignified, when he saw the third question, Mr. Leng's face was full of surprise, and when he saw the last question, Mr. Leng's eyes lit up, and then he picked up the pen and counted it on the paper.

After thinking for a while, Leng Chan stopped writing, as if he was pondering, the expression on his face changed, but his eyes gradually became dim, and finally his face was dazed, looking at the four questions blankly, but his mouth was still muttering: "There are pheasant rabbits in the same cage today, with thirty-five heads on it and ninety-four feet on it...... The chicken is two-legged and the rabbit is four-legged......"

Seeing Leng Chan falling into thinking, the students all looked at each other, their faces changed greatly, and they walked over one by one to look at the topic on the paper, and then they all looked dazed and stunned.

"Now there are animals, one with six heads and four-legged feet, and one with four heads and two feet, with seventy-six heads above and forty-six feet below. Ask how many of the two animals there are...... What the hell is this problem? ”

"There was a goose that flew from the South China Sea to the North Sea, it took seven days, a goose took off from the North Sea to the South China Sea, and it took nine days, and asked the two birds to take off at the same time, when will they meet? , how does Lao Tzu know when to meet? ”

"It's okay...... You look at the last question, is this also an arithmetic problem? ”

All the students were full of shock, and they looked at Li Changge as if they were looking at a demon.

No wonder Mr. Leng was also stumped, these topics are too weird, right?

The most terrifying thing is that it is all written by Li Changge, this guy is not only well written in novels, but also proficient in arithmetic, I am afraid that even the geniuses of the Nine Kingdoms can't compare to him!

Xiao Liang muttered: "I feel that I can't compare to Li Changge in my life." ”

Yun Yanqiu silently added: "You don't have to feel it, you just can't compare." ”

At this time, someone whispered: "It shouldn't be that he wrote it casually, and he can't solve it at all!" ”

Leng Chan said: "No, there is a solution!" None of these questions are wrong! ”

Mr. Leng said so, and the student had no choice but to put away his doubts.

At this time, Leng Chan raised his head, took out a pen and quickly wrote the answers to the four questions on the paper.

In the first course, there were twenty-three chickens and twelve rabbits.

The second way, eight beasts and seven birds.

The third way, the fifteenth of the sixteenth of three days.

The fourth, the diameter is twenty-six.

The students looked at Mr. Leng curiously and praised one after another:

"It's worthy of Mr. Leng, it's been solved so quickly!"

"These questions can really be solved, Mr. Leng deserves to be a middle-grade novelist!"

However, Leng Chan shook his head, his face was still blank, and he looked at Li Changge and said, "Although I solved it, I did it with a hard set, is there a correct solution to these problems?" ”

Li Changge thought that these questions were all from "Sun Tzu's Arithmetic" and "Nine Chapters of Arithmetic", although the correct solution was also proposed, but in his own time, there was a simpler and more convenient solution, that is, to set unknowns.

"Yes, Mr. Leng, please see, let's set the unknown number A first......" Li Changge deliberately taught Leng Chan the one-dimensional equation, so he explained while writing.

For convenience, he wrote down the Arabic numerals directly.

Leng Chan looked at the 1-9 Arabic numerals on the paper, suddenly looked dazed, and asked, "I saw you writing these things on the paper just now, what is this?" ”

Li Changge replied: "These are all numbers, and in the past, students felt that the calculation of numbers was too complicated, so they used simple symbols instead. 1 represents one, 2 represents ......"

After Li Changge finished speaking, the other students didn't understand, and they all thought it was an extra move, but Leng Chan's eyes lit up!

If you just look at a single number, Arabic numerals are indeed similar to the original, but if multiple numbers are combined, the former is undoubtedly more convenient!

I see, so that long numbers can be replaced by these symbols, and they don't have to be written so long...... Why didn't I think of it before? Li Changge, you are so smart! If these numbers had appeared earlier, our Shang country would not have declined in arithmetic! Leng Zen was amazed.

Li Changge felt a little embarrassed, these were not his own ideas......

He continued to teach Leng Chan how to perform column equations and how to calculate unknowns.

After all, Leng Chan is a five-grade novelist, and he understands it after just saying it once, his eyes lit up, and his face suddenly showed ecstasy, and he laughed and said: "I see, I see!" There is such a simple way to calculate in the world...... If you have a word, I am like an initiation! ”

Suddenly, the light in Leng Chan's eyes surged, and there was white qi rising above his head like a pillar, and then his body seemed to be covered with a thin layer of golden light.

He was stunned for a moment, and then ecstatic in his heart: "I'm going to enter the sixth grade!" ”