Li Hao didn't expect someone to ask questions so soon.

After Wu Lin heard the general's question about drinking horses, he couldn't help but shake his head: "This question is actually very simple, but it is difficult to understand it. ”

"Why do you say that?" Du Tao didn't quite understand, as a Chinese teacher, he only knew a little about these mathematical terms.

"There are too many typical models of the general's horse drinking, there are 16 common ones, if someone deliberately wants to ask Li Hao, maybe let him analyze these dozen models. Wu Lin voiced his concerns.

But unexpectedly, Li Hao just smiled, and then said: "In fact, the problem of the general's drinking horse, that is, the shortest path problem, is mainly based on 'between two points, the shortest line segment', 'among all the line segments from the point to the straight line, the perpendicular line segment is the shortest' and the use of the nature of axis symmetry, plane expansion diagram and other knowledge to solve. ”

"In particular, it is necessary to use axis symmetry for transformation, and to transform spatial problems into plane problems to solve the shortest path problem in junior high school mathematics. ”

"Then I'll draw a few common models for you, these questions have traps, do you want to take notes?"

While Li Hao picked up the chalk, he also looked at the male classmate who had just asked a question.

The boy was stunned, then opened the notebook on the table, ready to take notes.

Li Hao drew a simple model on the blackboard behind him, then turned around and said: "Let me tell you, first of all, there are two situations in the two points and one line, the first is that the two points are on the opposite side of a straight line, and the points A and B are on both sides of the straight line n, and find a point P on n, so that PA+PB is the smallest." ”

"We have done this type of problem many times, based on the shortest line segment between two points, so what kind of model is it that is more difficult for us? That is the shortest path problem in the three-dimensional figure expansion diagram. ”

"Let's draw a cylinder where ABCD is an axial section of it, AB=8/π, BC=3, and an ant wants to crawl from point A to point C, so what is the nearest distance. ”

As soon as this question came out, the students in the audience immediately started to discuss it.

Because in the cognition of junior high school students, the general's drinking horse is generally a matter of plane dots and lines, which rarely involves three-dimensional figures, and it is also a cylinder.

Long Jiayang saw that no one seemed to be able to say the answer, so he immediately asked Ji Mingcheng in front: "Mingcheng, can you figure it out?"

"It doesn't feel difficult, but I just can't turn my head around for a while. Ji Mingcheng frowned, scribbling on the paper.

When Long Jiayang heard this, it was so difficult for even the top students in the class to do this question, and he immediately became happy: "Hehe, even the top students can't do it, it seems that there are few people here who can do it." ”

He even craned his neck and glanced at Liu Xiuyuan in front of him, and found that she didn't have a complete answer written on her scratch paper, so he was even more sure that this was a difficult problem.

But only Mr. Wu Lin laughed.

"What's wrong, it's difficult?" Du Tao asked anxiously.

Wu Lin shook his head: "This kid thief, in fact, this question is not difficult, but the plane is converted into a three-dimensional cylinder, which causes many students to have no idea where to start." ”

Li Hao saw that no classmates in the audience answered, so he said: "In fact, we only need to expand the side of the cylinder to unfold the side of the cylinder, and the result can be obtained by 'the shortest line segment between two points'." ”

"Expand the cylinder and connect A, C, AB=12·π·8/π=4, BC is equal to 3, AC is equal to the square of 4 under the root number plus the square of 3, and the final result is equal to 5. ”

After Li Hao finally wrote the answer on the blackboard, he looked back at the boy: "I don't know if you have figured out this variant question?"

The boy seemed to blush, and he finally nodded and sat down.

In this way, in the next half an hour, the students in the audience asked Li Hao five or six questions one after another, and he could answer them fluently, and even reserved some time to explain the extended questions to them.

His performance completely conquered the students below.

At this age of junior high school, as long as you have a level and talent, then you will be admired and respected by many people.

"Bang Bang Bang!!"

The students even spontaneously applauded Li Hao.

In fact, not only the students, but also the teachers standing in the back were very surprised.

Li Hao's current state and typhoon are very similar to a teacher who has been engaged in education for many years, and even more experienced than some teachers who have just come to the school.

The most important thing is that the rhythm of his lectures is just right, so that Du Tao can't help but sigh: "This kid, when he comes out of reading in the future, is a material to be a teacher." ”

"I guess his ambition is not to be a teacher. Teacher Wu Lin squinted his eyes and said thoughtfully.

But at this moment, a girl stood up, and Li Hao looked over and found that it was a student in Class 8 again.

She said bluntly: "They were all asking questions about math, physics and chemistry just now, can I ask you questions about the liberal arts?"

Li Hao smiled bitterly in his heart: This class teacher of Class 8 is really undead, and the ghost is still lingering.

So he said, "Well......

"Actually, I'm only a 46th grade student, and not every subject is strong, otherwise, I would have been the first in my grade, you say. ”

As soon as this sentence came out, everyone agreed, after all, it is also a tacit fact that boys' liberal arts are generally weak.

"Well, I can do my best, you ask. ”

Li Hao changed his words and faced the battle directly!

The girl seemed to be prepared, she picked up the notebook and read: "In the Great Unification Dynasty, who is the emperor with the fewest concubines?"

"Wow~~"

When many students heard this question, they all coaxed.

Because they all know that the emperor's harem has three thousand beauties.

If you ask the emperor with the fewest concubines, they really don't know.

But the students of Class 16 gradually realized that something was wrong.

"Hey, you say, why do the students of Class 8 keep asking these weird questions?"

"Yes, even the emperor with the fewest concubines has asked this kind of question, how could Brother Hao know!"

"That's right, we don't take these tests in our books!"

"Damn, I'll beat them up later. ”

Xu Zijun was very angry, in fact, as early as the third student in class 8 asked, he sensed that something was wrong.

Isn't this a clear bully of his own brother?

Long Jiayang also said angrily: "Brother Jun, you will teach those two men a lesson later, and I will come to the woman." ”

After Xu Zijun heard this, he turned his head to look at Long Jiayang.

Long Jiayang immediately changed his words and said: "I mean, I took the girl in our class to ask the girl for an explanation, and the explanation ......."

When Li Hao heard this question, he was happy, and then said: "In fact, the answer to this question has also appeared in history books. ”

"Huh, won't you?"

"Really?"

"Bragging. ”

Li Hao immediately wrote the three words Zhu Youzhu on the blackboard: "Ming Xiaozong Zhu Youji!"

"He is the only monogamous emperor in history, he has only one queen, no concubines, no beauties; Ming Xiaozong and Empress Zhang get along with each other day and night, the same as ordinary people; moreover, he is also a good emperor, diligent in political affairs, attaches importance to justice, speaks widely, and strives to reverse the corruption of the court and government!"

As soon as this passage came out, everyone was stunned.

They think, why does Li Hao even know how many wives the emperor has?!