The lively ink technology exhibition ended, and Chang\'an city quietly recovered its peace.

However, the ancient well of Guanzhong has quietly changed a little. Quyuan plow showed its style in Guanzhong area. It is convenient, labor-saving and has good cultivated land effect. It soon conquered countless farmers.

In this era when land is the most precious wealth, people may be frugal, but they are extremely generous for the convenience of farming. Three hundred Wen says whether it is expensive or not, but if more acres of wasteland are reclaimed, all the capital can be earned back in a year. Even the most stingy miser is willing to spend money on farming.

Let alone quyuanli in Mojia village has a seven-day guarantee and three-year warranty policy.

In an ordinary peasant household in Guanzhong area, men drive cattle and pull a Qu Yuan plow to work in the field early in the morning, while women babysit the newly bought chicks at home.

Now the weather is still very cold. Usually, these chicks are covered tightly in the house. They only go out to get some air and bask in the sun at noon on a sunny day.

This year, more than ten acres of wasteland have been reclaimed at home, and twenty chickens have been raised. The hens keep their eggs. In the summer, the cocks sell for money. At that time, they buy a batch of chicks and wait for the new year to eat meat. When they think of their own life, the life of the family seems to be getting better and better, and the women\'s eyes are narrowed to the crescent moon.

During the ten day break of the Imperial College, a large-scale transformation was carried out. The blackboard and chalk entered the highest University of the Tang Dynasty, and the response was good. No matter how Dr. Guozi had an opinion on Merton, they were unanimous in praise of the blackboard and chalk.

The Imperial College is the wind vane of education in Chang\'an city. For a while, private schools, large and small, in Chang\'an City ordered blackboards and chalk from Mojia village. The construction team of Mojia village was almost too busy.

"The Duke of Zhou made rites with nine numbers, and nine numbers are the nine chapters!" Shen Hongcai, a doctor of mathematics, picked up the chalk and wrote down the contents of the nine chapters of arithmetic on the blackboard. Merton was surprised to find that Shen Hongcai carefully separated the nine chapters of arithmetic with various punctuation marks, and the semantic expression was particularly clear.

After the day-to-day study of the Imperial College, a new punctuation mark was finally issued. Although it is not small different from the punctuation marks of later generations, Merton did not stimulate them again, but silently changed his own symbols.

At that time, the young students happily accepted this trendy symbol, which was simple, clear and clear at a glance. However, the promotion of Dr. Guozijian\'s teaching assistant was not so smooth. Many older Dr. Guozijian still refused to use punctuation marks and still had a wayward long talk, which made the students miserable.

However, mathematics is an accurate knowledge. It is reasonable for Shen Hongcai to take the lead in using punctuation in order to improve the accuracy of mathematics and avoid ambiguity.

"Nine chapter arithmetic is the most important subject in mathematics. Everyone must be proficient. If you take the final exam, don\'t blame me for being unreasonable!" Shen Hongcai snorted coldly with sharp eyes.

Since Li Shimin ordered Guozi invigilators to take the math test in the future, math has suddenly become an important subject related to the future of Guozi invigilators. Shen Hongcai swept away his previous grievances and greatly increased his power.

"Now let\'s start the performance board!" Shen Hongcai Shua wrote down several questions on the blackboard and looked at the supervisor.

Suddenly everyone was crying! Everyone\'s eyes stared bitterly at Merton.

Morton felt his nose awkwardly. It was not his idea, but Shen Hongcai\'s own invention.

Since I used the blackboard, I suddenly learned by myself without a teacher, and realized the most commonly used move of millions of teachers in later generations, the performance board.

Several arithmetic problems were written on the blackboard. After one group of students finished writing, they changed to the next group. If time didn\'t allow, Shen Hongcai wanted to pull everyone up and perform them one by one.

Once that classmate makes a mistake, the consequences will be very serious. It is estimated that your name will be on every performance board next week.

Of course, apart from Zu Mingjun and Merton, Shen Hongcai didn\'t even look at these two perverts no matter how high their hands were raised. Zu Mingjun said that every time a student made more mistakes, Shen Hongcai would pull him to the rescue.

However, Merton\'s level of mathematics is not enough. Shen Hongcai feels that his level is not necessarily comparable to him, so he won\'t take the risk of losing face.

"Kong huisuo!" Shen Hong began to call the roll.

Kong huisuo lamented that his arithmetic level was not good. He had missed it several times before. Sure enough, Shen Hongcai still didn\'t let him go this time. The appointed came forward to pick up chalk and start calculation, hoping to pass this time smoothly.

Shen Hongcai ordered the names of the two people and suddenly found that one hand was raised high.

"Qin Huaiyu!" Shen Hongcai looked at Gao Gao and raised his hand in surprise, indicating that it was the ordinary poor student Qin Huaiyu who wanted to perform.

"This guy is really dead. He should be in the limelight at this time!" many people were in an uproar. Who doesn\'t know Qin Huaiyu\'s level? If he can do it, they won\'t believe it.

"Are you sure?" Shen Hongcai\'s face was a little gloomy. He felt that Qin Huaiyu was making trouble for him.

"I\'m sure!" Qin Huaiyu said proudly. Sao Bao despised the whole class. This kind of small topic closed the abnormal Merton. It\'s a small Witch to see a big witch.

Morton looked at Qin Huaiyu\'s Sao Bao and couldn\'t help feeling a headache. This guy was in the limelight again.

Seeing Qin Huaiyu\'s insistence, Shen Hongcai asked him to go up.

Qin Huaiyu deliberately stood beside Kong huisuo. Kong huisuo saw Qin Huaiyu standing beside him and couldn\'t help gloating.

Qin Huaiyu\'s level is well known to him. He can\'t do arithmetic, but Qin Huaiyu can\'t do all of it. He\'s even worse than him in arithmetic. This time he had another companion.

However, to her surprise, Qin Huaiyu picked up chalk and kept brushing. Kong huisuo looked at it curiously, but Qin Huaiyu deliberately covered it.

"Hum, play tricks."

Kong huisuo snorted coldly. He didn\'t believe Qin Huaiyu could do it.

To his surprise, only after a while. Qin Huaiyu wrote the answer, threw the chalk in his hand and went down.

He\'s done. Kong huisuo stared at the open space next to him. Wrong! Kong huisuo expected Shen Hongcai to announce that his answer was wrong. However, Shen Hongcai was more shocked than him because the answer written by Qin Huaiyu was completely correct.

"Well, classmate Qin has made great progress recently. We should learn from him." Shen Hongcai praised dryly. "There is another question below. Which classmate is willing to come up and do it."

Cheng chumuteng stood up, rushed to the blackboard, brushed three times five divided by two, and wrote the correct answer.

"No!" many national supervisors wailed, even Chumo, a big guy.

Then Wei Chi Baolin made a math problem that baffled Kong huisuo, which refreshed everyone\'s three views.

What happened to the world?

They found that the poor students who had been at the end of the crane in the class unexpectedly counter attacked!

What\'s more sad is that Kong huisuo found that he had become the worst student in mathematics.