Gu Xu looked proud: "Teacher Zhang said I understand, what else do you have to say!"
Wang Xianchao clenched his fists. When Zhang Xiaoli said this, he knew very well that he had lost.
However, even if you lose, you cannot admit defeat.
He glared at Gu Xu: "Teacher Zhang asked you to tell the story to other students to see what you can tell!"
"What I tell you is my business. What I tell you today is not to prove myself to you, but Teacher Zhang asked me to share it with you, and I also want to help you learn."
"Okay! I'll see how many people you can understand!"
Gu Xu ignored him. Such a person would not shed tears even when he saw the coffin.
No need to say more, just seconds!
Gu Xu looked at Zhang Xiaoli: "Teacher, let me put it another way."
Zhang Xiaoli was surprised for a while: "Teacher Zhang, can I ask Zhang Song and Jia Fanzhen to come up and help me?"
Zhang Xiaoli nodded.
Zhang Song and Jia Fanzhen came up together.
Gu Xu would not let Lan Ruosi come for such a thing.
First of all, he knew that his little daughter-in-law was shy, and she would definitely be embarrassed in such an occasion.
Secondly, how could he be willing to let his little wife be a prop?
Zhang Song and Jia Fan were really confused.
Gu Xu asked Jia Fanzhen and Zhang Song to stand at his designated position.
After the two of them stood, Gu Xu fiddled with the projector again, projecting their shadows on the screen.
"Everyone, please pay attention. They are standing separately, one on the left and one on the right. Are there two shadows?"
"Yes!" Everyone nodded.
"OK!" Gu Xu also nodded, "You understand this! The two of them form two lines. So, as we said, the triangle is the most stable, and the parallel lines are unstable. Let's start moving now."
Gu Xu said and walked to Zhang Song and started to move Zhang Song.
Gradually, Zhang Song's shadow and Jia Fanzhen's shadow overlapped on the screen.
"Look now, everyone, although they are two classmates, there is only one shadow projected on the screen.
What our classmates don’t understand is probably because drawing on a flat surface does not have a sense of three-dimensionality, and there will be visual errors, which are obvious when you look at it this way. "
As soon as these words came out, the crowd was in an uproar, and everyone seemed to understand instantly.
Lan Ruosi exclaimed: "I understand too! I was just wondering why there are two lines."
Zhang Xiaoli nodded silently when she heard Lan Ruosi say she understood, "You understand too?"
Lan Ruosi said: "Yes, I understand too! My mind was not open before, but after I saw Gu Xu make it, my mind was open."
Zhang Xiaoli was a little worried: "Please do it for me!"
Lan Ruosi immediately started drawing on the scratch paper.
Zhang Xiaoli watched her drawing process and nodded happily: "Yes, you did it right."
Lan Ruosi and Gu Xu understand, she will win.
As for other students, only those who understand them count.
Lan Ruosi smiled and said, "Thanks to Gu Xu."
She looked at Gu Xu again.
Gu Xu continued: "In addition, there is also a problem of spatial imagination. When we draw pictures, we are on paper, which can be extended infinitely.
For this geometry, let’s first look at its sides. Each side has opposite parallel lines.
After antithesis, just like the parallel lines we usually draw on paper, when extended like longitude lines, they will intersect at the far south pole and the north pole. By doing this, the problem will be solved naturally. "
"I understand!" one of the classmates said.
"I understand too!" said another classmate.
Everyone answered one after another and everyone understood.
"Okay, you all understand, I can go down now!" Gu Xu said and walked towards his seat.
"Do you understand?" Gu Xu asked as soon as he came back.
Originally I was just telling my daughter-in-law, but now I’m telling it to the whole class, and I don’t know if she understands it.
"I understand!" Lan Ruosi nodded, "I understood it when you were halfway through writing."
"As long as you understand." Gu Xu breathed a sigh of relief. It didn't matter whether others understood or not.
Jia Fanzhen and Zhang Song also sat down.
Jia Fanzhen sighed: "Little Sisi is a top student, and Gu Xu is a god! Little Sisi, I won't be able to help you with your bragging when I go out in the future."
Lan Ruosi smiled: "Gu Xu is already very good!"
Lan Ruosi said and looked at Gu Xu.
Zhang Song answered: "Why, Lan Ruosi is the top student and Gu Xu is the god of study."
"My little Sisi's grades are so good, she is recognized as a top student. But this time, Gu Xu is better than her. Anyone who is better than a top student is a god of study, isn't it?"
Zhang Song suddenly said: "Yes!"
He said and gave a thumbs up to Gu Xu: "Xue Shen, my future studies will depend on you!"
When everyone saw that Gu Xu had done it, they also praised it.
"Gu Xu is really amazing!"
"I didn't expect Gu Xu's math scores to be so good."
"Gu Xu took some elixir and his academic performance improved by leaps and bounds!"
Wang Xianchao was very dissatisfied when he saw this. What he was proud of was just a question! What's so great.
Yang Wanli, who was sitting below, was also very dissatisfied: "Idiot Wang Xianchao actually lost to Gu Xu. It's really embarrassing."
Zhang Xiaoli saw everyone talking and said, "Okay, everyone, be quiet for a moment. Students who don't understand should go down and think about it again, or ask their classmates."
Zhang Xiaoli nodded: "Gu Xu's explanation is very careful and the ideas are correct. After countless mappings, the original model and the mapping have changed beyond recognition.
Everyone must pay attention to the two points mentioned by Gu Xu just now, overlapping lines and infinite extension. If everyone still doesn't understand something, you can ask Gu Xu or Lan Ruosi. I just listened to her and she understood. "
Zhang Xiaoli looked at her watch as she spoke: "There are still ten minutes before get out of class ends. Let me say something. Today is the 24th, tomorrow is the Mid-Autumn Festival, other grades have a holiday, and we have classes as usual. Until this Sunday."
October 1st, National Day falls on Monday, the school has a three-day holiday, and classes officially begin on the 4th. However, after discussion with the senior year group, our senior year of high school will not have a holiday, and make-up classes in the evening will be suspended for three days.
There will be no make-up classes on Sunday night, that is, the night of September 30th. There will be no make-up classes on the nights of October 1st and 2nd. Makeup classes will continue on the night of the 3rd. Did you hear that clearly? "
"Listen clearly."
After saying that, the bell rang for the end of get out of class.
Everyone packed their schoolbags and prepared to go home.
As soon as the four of them walked out of the classroom, Wang Xianchao came over again and stopped Lan Ruosi.
Gu Xu said angrily: "What are you going to do again!"
"Classmate Lan, can you tell me about this question? Just now, Teacher Zhang said that if I don't understand anything, I can ask you."
Gu Xu smiled disdainfully: "With chicken feathers as arrows, everyone knows Sima Zhao's intentions."
Lan Ruosi didn't have time to speak.
Wang Xianchao added: "Classmate Lan, I know where you live. Can I go home with you? We can walk and talk on the way."
"I'll go!" Zhang Song exclaimed, "You really dare to say this."
Gu Xu was puzzled. He actually knew where my wife lived. This was such an effort.
Lan Ruosi smiled faintly: "I didn't speak well, you should ask the teacher tomorrow!"
She said and wanted to move forward.
Wang Xianchao added: "It's okay if you don't talk about the topic. I'll take you home. My car is already waiting for me outside. I'll ask the driver to take you home first."
