Princess Ningguo's beautiful and noble face showed a look of worry, and she subconsciously looked at her brother Li Xian.

This Li Guo is a natural arithmetic wizard, who studied under many arithmetic masters in the Central Plains and foreign lands, and became famous in Chang'an as early as twelve or thirteen years old. When Li Longji was in power, he once faced the joint examination of more than a dozen arithmetic masters in Tianzhu, Persia and other countries as a young child, which shook Fanbang and had the reputation of an arithmetic prodigy.

It is true that Kong Sheng is talented and learned, but most of the scribes only have a slight dabbling in arithmetic and other miscellaneous aspects, and it is impossible to study them in depth. Kong Sheng was provoked by Li Guo, and used his own shortcomings to fight Li Guo's strengths, wouldn't it be self-inflicted?

Li was also a little worried. But the Li family knew that Kong Sheng was definitely not an impulsive and vindictive person, and since Kong Sheng dared to accept the move, it showed that he must have a countermeasure.

Li Xiang cast a calm glance at his sister.

The scribes present all held their breath and showed excitement on their faces, and the good show was about to be staged, and everyone was happy to watch the excitement. If Li Guo can suppress Kong Sheng's rising reputation, many people will actually gloat.

Du Hong's courtiers sat together, glanced at each other, and saw expressions that seemed to be smiling but not smiling from each other's faces. On the surface, these people did not completely fall to Li Jiao, but in fact, they had already stepped into the palace of the king of Chu with one foot. It's just that because of the situation, I had to reluctantly come over to cheer for Princess Ningguo.

I don't have too deep a bad feeling for Kong Sheng, Du Hongjian and others, but I can't talk about friendship either. In fact, the attitude of these treacherous and cunning courtiers to Kong Sheng depends entirely on the development of the situation and the attitude of the emperor.

Now it's vain to say anything.

Therefore, Kong Sheng was provoked by Li Kuo's son, and they had an indifferent attitude.

Li Guo obviously came prepared, he turned around and waved his hand to his master. Three or five attendants hurriedly brought a question board several feet square from outside the field, and a blank piece of paper was pasted on the board.

A scholar has a small desk on it. Then start kneeling and grinding.

Li Guo walked over excitedly, held the brush and paused slightly, then brushed and wrote an arithmetic problem on the white paper of the question board-

Nine hundred and ninety-nine dollars, one thousand seasonal pear fruits. 11 pears 9, 7 fruits 4 pennies, how much is the price of pears?

Write it. Li Guo restrained his hands and looked at Kong Sheng with a sneer.

Everyone present focused on the topic board and gasped. Where is this ordinary arithmetic problem, it is clearly a peerless proposition that is difficult to crack. Don't say that most people can't understand it, even for Du Hongji, who is quite involved in arithmetic, he is also frowning and thinking hard.

Kong Sheng paced over, staring at Li Guo's proposition, and a hint of playful brilliance flashed in his eyes. It must be admitted that in the context of the development of arithmetic in the Tang Dynasty. Although Kong Sheng is not a mathematician, as a graduate of a prestigious university, he has more than ten years of foundation in mathematics system education, so what is the difficulty of listing a few equations?

Li Guo sneered on the side: "Chang'an Hou, do you have an answer?" ”

This is a proposition that Li Guo solved after studying it for three days. Li Guo has strong self-confidence in arithmetic and learning, and he doesn't believe that Kong Sheng can solve problems on the spot.

Kong Sheng smiled silently.

He grabbed a pen from the small desk next to him. But he didn't rush to solve the problem, but turned around and looked at Li Guo and said lightly: "Li Gongzi used such a profound arithmetic proposition to test Kong. It's painstaking. ”

Li Guo pursed his lips: "In Li Guo's opinion, this is just a very simple arithmetic proposition, which can be answered by any student in the Guozi Prison, does this stump Chang'an Hou?" ”

Kong Sheng smiled: "It seems that Li Gongzi is expected that Kong will not be able to answer." ”

The corners of Li Guo's mouth twitched: "It's useless to play with your tongue, everyone is waiting for Chang'an Hou to solve the problem." Please do it as soon as possible. ”

Kong Sheng sighed, turned around, held a pen and scribbled a large number of words and numeric symbols in the blank space of the paperboard that no one could understand—

Solution: Set a pear; Fruit B piece. Then: A+B=1000, 11A/9+4B/7=999. A system of two-formula simultaneous equations, solved: A=657 (pcs). B = 343 (pieces). Then: pear blossom to price = 657x11/9 = 803 (text); Price = 343x4/7 = 196 (text). Answer: I bought 657 pears and spent 803 yuan; I bought 343 fruits and spent 196 dollars.

After writing, Kong Sheng threw the brush in his hand on the desk, and said with an indifferent smile: "Li Gongzi, is the answer correct?" ”

Li Guo was dumbfounded, Kong Sheng's problem-solving process made him unbelievable, and these strange ways he wrote gave him an extremely shocking sense of novelty, but the result was undoubtedly correct.

Li Guo's complexion changed suddenly, and he almost thought that Kong Sheng knew the question in advance. If he hadn't studied the proposition in advance, how could he have cracked this mysterious proposition? Even if he is also a wizard of arithmetic, it is impossible for him to solve it so quickly?!

Li Guo nodded with an embarrassed expression.

The powerful scholars present let out a collective exclamation, and many people looked at Kong Sheng again, and there was a deep complex light in their eyes. Du Hongjian was also very surprised, Li Guo's problem he had been solving, in such a short period of time, he had not figured out a clue at all, but Kong Sheng easily solved it.

Kong Sheng shrugged, waved his hand neatly, and turned around to walk towards his seat.

Li Guo was unwilling to change color, suddenly rushed forward, peeled off the paper on the question board, and then ordered the scholar to paste one again, and said loudly: "Chang'an, slow down!" ”

Kong Sheng turned around slowly: "Does Gongzi Li still want to continue to test Kong?" ”

Li Guo gritted his teeth: "Li Guo still has a problem, think hard about how to solve it, if Chang'an Hou can't solve it, he will worship Li Guo as a teacher to learn the way of arithmetic!" ”

Kong Sheng frowned, and the anger in his heart swelled little by little. He looked at Li Guo and said coldly: "Li Gongzi, let's stop in moderation, leave a line in everything, so that we can see each other in the future." If you insist on being aggressive, don't blame Kong for turning his face and being ruthless. ”

Li Guosheng blushed and stiffened his neck and shouted: "Chang'an Hou, it's useless to talk more, do you dare to solve the problem?" If you don't dare to solve the problem, please don't think of yourself as the head of the world's young scholars in the future! ”

At this time, Li Chuan suddenly jumped out and shouted: "Marquis of Chang'an, you are known as the number one genius in Jiangnan, and you are cowardly on the spot, but don't lose the face of the scribes and people in the thirty-eight states in Jiangnan!" ”

Immediately, Li Guo's group of fox friends and dog friends rose up and coaxed.

Kong Sheng took a deep breath and said indifferently: "In that case, don't gossip, you can make a question." ”

Li Guo's face was solemn and pondered for a while, and then he slowly wrote down a question:

Chickens and rabbits are in the same cage I don't know how to count, and thirty-six cages are exposed.

Count 50 pairs of feet, how many chickens and rabbits are there?

Kong Sheng couldn't help but smile when he saw it, this is a very famous arithmetic problem, which may be mysterious and difficult to solve in the world, but after hundreds of thousands of years of calculus research, there have long been many ways to solve it, and many junior high school students can easily solve it. Li Guo used this to make things difficult for himself, he really lifted a stone to shoot himself in the foot, and brought humiliation on himself.

"This question is even simpler, there are 22 chickens and 14 rabbits." Kong Sheng replied loudly.

Li Guo was dumbfounded, and his face changed miserably.

He was silent for a moment before he said in a trembling voice, "You...... Li Guo pondered this question for ten days, and he didn't sleep for two days and nights before he came up with the answer, but you ...... You must have been blinded......"

Kong Sheng sneered: "This kind of simple arithmetic problem can be easily solved by children in Jiangnan, let alone Kong?" Does Li Gongzi look down on himself, or despise the people of the world? ”

Kong Sheng immediately said loudly: "Kong also has a question, please ask Li Gongzi to solve one or two." If you can't crack it, you don't need to worship Kong as a teacher, just punish the three big wines and make everyone laugh! ”

Kong Sheng's eyes flashed with a hint of playful brilliance.

Li Guo stiffened his head and said in a trembling voice: "Why don't you dare? ”

Kong Sheng sneered, stared at Li Guo, looked at him like a knife, and said word by word: "Li Gongzi listened well, listened carefully." (To be continued.) )