Gan Lun took out the title and read: "In the second year of Hongxuan, Wu County and Guanlin reorganized the officials, and received the original salary in the first year and three thirds and two salaries in the next year. The original state in the first year after entering the customs forest; 20 in the following year; Again increase the original salary by half percent. Question: What is the hourly salary of 16 in a certain two years, and what is the salary for four years after entering the customs forest? ”

When he finished reading the question, everyone was taken aback and sighed, "Oh, that's it." Ah, great, this question can be done, Lord Gan, your student is amazing. ”

Because this topic is a difficult problem accumulated by the household, everyone is familiar with it.

At that time, the Great Jin Dynasty was newly established, and after the war, the people did not have one out of ten, and the treasury was also very empty.

In order to reduce expenses, the court decided to merge two or three counties together to form a new large county. In this way, the number of official posts in the yamen should be reduced, and they should be diverted according to performance.

Because the court could not pay the salary, the salaries of the officials who were willing to be diverted were reduced in the first two years; After the economy of the Great Jin Dynasty recovers and the treasury is full, it will increase year by year to make up for the original arrears of wages.

In order to know how much it needed to be increased so that the officials could make up for the loss of the original arrears, and how much money the court needed to pay the officials and whether the treasury income could afford it, the emperor at that time asked the officials of the household department to calculate this figure. If you can't afford it, you have to adjust the increment and prolong the time to make up for it.

If you only calculate the salary of a certain official, it is naturally easy, and everyone can add and subtract a little to calculate it.

But this is not an official, but a local official across the country, and the salary level of each official is not the same. There's going to have to be an algorithm.

At that time, the officials of the household department were stunned and did not know how to calculate the formula. In the end, he could only use the method of death, and forcibly calculated one province, one county, and one official, and boiled up until the entire household officials went to half a life before calculating this data and handing it over to the emperor.

After that, this topic became a difficult problem for the household department to solve. Every new household official, who boasted that he had learned well, had to give it a try, but they all hit the south wall.

"Oh, I think when I first entered the household department, I didn't think about tea and food in order to understand this problem, and I almost became ill. In the end, it was my wife who scolded me and told me to live with arithmetic, so I threw it to the back of my mind. An official said.

When everyone heard this, they all laughed "haha".

Almost everyone has the same experience.

"Don't talk nonsense. Since Lord Gan has explained it, hurry up, Lord Gan, please tell everyone how to solve it. Someone urged.

Gan Lun learned and sold now, and relayed what Zhao Ruxi said: "This is a problem of reducing staff and increasing efficiency, which belongs to the problem of 'number series general terms' and 'function maximum' models." ”

Everyone: "......" understands every word, what does it mean together? I don't understand!

"Lord Gan, can you speak human words? I don't understand. Someone shouted.

"You don't understand, do you?" Gan Lun stroked his beard and asked with a smile.

Everyone nodded.

Gan Lun squinted at Guo Jitong: "Master Guo is very good at arithmetic, I think I understand." Why don't you tell you about it? ”

Guo Jitong's face was not very good-looking, and he arched his hand with a smile: "Guo is ashamed, I don't dare to be the word 'powerful'." Guo also didn't understand, and asked Master Gan to give advice. ”

Qi Xugu hurriedly played a round: "Lord Gan, don't sell Guanzi, hurry up and tell us." ”

Gan Lun also knew Qi Xugu's embarrassment, so he didn't target Gan Lun again, retracted his gaze, and told Zhao Ruxi what he told him about the solution idea.

When Zhao Ruxi told Gan Lun at the beginning, he tried to use it to explain the places that could be explained by the Dajin arithmetic, and if he couldn't explain them, he directly told Gan Lun which theories in Empress Shengyao's arithmetic book were used.

Gan Lun's memory is also okay, but he told Zhao Ruxi's solution.

The place of the household department is not as good as other yamen, that all need to roll up their sleeves to do practical things, the vast majority of people are more proficient in arithmetic, and few rely on family background or welcome in.

From the part of the words that everyone understood, they could feel that what Gan Lun said was right, but when it came to the part of the theory of Empress Shengyao's arithmetic book, everyone scratched their ears and cheeks.

Everyone was about to grab Gan Lun and ask him carefully, but Qi Xugu grabbed Gan Lun's arm: "Brother Qi, come, you come into the house with me, I have something to tell you." ”

He waved his hand at everyone again: "I know that you still have a lot of questions you want to ask Master Gan. But it's late today, isn't someone going to attend the auction held by the Fifth Highness? Hurry back to pack up and get ready to go down. Master Gan can't run again, and there will be time to ask him for advice in the future. ”

With that, he pulled Gan Lun into the back room.

The officials outside had to scatter with a bang.

Gan Lun was pulled into the house by Qi Xugu, and he was still unhappy.

Although Zhao Ruxi's problem-solving theories are some that he can't understand and can't explain thoroughly to everyone, he is not here to give a lecture to everyone, but to show off the students. When the time comes, just say, "That's what the student told me, and I don't understand," and you can be completely irresponsible.

And everyone is proficient in arithmetic, and you can see the whole leopard at a glance, even if you don't understand some places, but whether the general idea is correct or not, everyone can still feel it.

That's what he wants.

Although he can't say the name of Zhao Ruxi, a student, it is no problem to pave the way for her and promote her reputation.

The cone is in the sac and stands out.

He believes that Zhao Ruxi's arithmetic talent cannot be hidden.

When her reputation in painting has also gone further, she has become a master of painting and a celebrity, this talent does not need to be hidden, and the things he has done for her today are not completely useless.

So Gan Lun interrupted him to show off his students, but he was reluctant in every way.

Qi Xugu didn't care whether he wanted to or not, and asked, "Can you really understand Empress Shengyao's arithmetic book?" ”

"I don't understand." Gan Lun's head shook very neatly.

Qi Xugu: "......"

He glared at Gan Lun: "Then how did you use the theory you just solved the problem?" ”

"That's what my student did."

"Which student are you? You name it. If you don't say it, I'll assume that you understand it and don't want to tell everyone. I will go to report to the emperor tomorrow, saying that you understand Empress Shengyao's arithmetic book, but you cherish yourself and are unwilling to teach everyone. When the emperor's decree comes down, you say it's too late if you don't understand. Qi Xugu threatened.

This time it was Gan Lun's turn to glare: "You, you, you...... How dare you be such a scoundrel? ”

"Hmph, you didn't force me?"

Qi Xugu is worthy of being a person who can do the book of the household, and after saying this, he collapsed his face and began to play the sad card.

"Lao Gan, we are also colleagues in the household department for decades, and we spend more time together than our families. You are not unclear about my suffering. ”