Chapter 80: The slap in the face came too fast, like a tornado
Of course Chu Qingmian himself became more and more unsure the more he wrote.
This is just like the four answers to a multiple-choice question: 1, 2, 3, 4, and she calculated the answer to be √648.
When she stopped writing and started to look back to check, Zou Lian on the side had just finished writing the last step.
"Teacher, I have finished writing."
Li Lu walked over, took a look, and nodded approvingly.
"Yes, this method is correct, and the process is also written in detail. You can use it as a reference answer."
This made Chu Qingmian even more unable to think. My brain has gradually gone blank.
Han Bing couldn't help lowering his head and cursed secretly:
"Conspicuous bag."
Li Lu turned her head to look at Chu Qingmian's progress. Seeing that she pursed her lips and seemed a little nervous, she comforted her:
"Students who haven't finished yet, don't be anxious, think slowly."
Su Chengyi looked at Chu Qingmian's back and suddenly raised his hand.
“What’s wrong?”
Li Lu was a little surprised to see him raising his hand at this time.
All the students in the classroom followed her eyes and Su Chengyi put down her hands, pulled out her chair and stood up.
“There are other methods I want to share.”
“Oh, welcome.”
Li Lu clapped cooperatively, and others followed suit. Raise your hands.
Walking to the podium, Su Chengyi glanced at Zou Lian's writing process.
How should I put it, there is a feeling of being detailed for the sake of being detailed, and many steps that are not necessary to be written out have to be written down.
The blackboard has a push-pull design. Su Chengyi did not move and pulled the clean side in front of him.
He was not in a hurry to write. He coughed a little deliberately at first. Chu Qingmian next to him immediately raised his eyes and looked at him like a frightened deer.
What is this reaction?
Don’t you think that you came here specifically to laugh at her?
Tapping his fingers on the blackboard, he raised his hand to write:
（AD/AM）(sinx/sin(x+B))
Chu Qingmian saw what he had written exactly. It was part of my own steps. I was stunned for a moment and checked my own. Only then did I realize that the process had been written wrong from the beginning. I hurriedly turned around to get an eraser.
Seeing that she had understood it, Su Chengyi directly erased the formula he had written with his hand.
Then he wrote "一" slowly.
"1. Taking the angles of triangle ABC as the basic quantity, calculate CP first, then PM, and finally MQ."
"It can be obtained from the sine theorem"
Su Chengyi inserted a hand in In his trouser pocket, the other hand was writing calculations in a fluid manner, with almost no pause during the process.
Everyone under the podium was in a daze, including Li Lu.
Even if she is asked to do this question, she still needs to look at the picture and write at the same time. Otherwise, she is very likely to read the wrong dot or side letters.
"Then if ∠BCQ = ∠BAC, then the above conclusion is true."
"Next, we only need to show that the point Q that satisfies the above conditions is unique."
"Prove this premise I can roughly write down five of the conditional methods. I probably can’t write the complete process here, so I won’t write it down yet.”
Su Chengyi did not look back and listed five small numbers on the blackboard.
"They are the identity method, monotonicity, cosine theorem, and series of equations. Of course, you can also choose to explain directly."
When he said this, there was a sound of copying notes under the podium.
After Chu Qingmian corrected the mistakes pointed out by Su Chengyi, he was enlightened and quickly finished writing his own method.
When she turned around, she saw that Su Chengyi had written another method on the blackboard. When she was thinking along his steps, the other party raised his hand and wrote "two" again.
"The picture on your side is clean, so borrow it."
Su Chengyi raised her hand to draw auxiliary lines on her side of the picture. "Suppose ME intersects AB at point H, then MH=HE."
“.”
“It can be directly proved that triangle QBC is similar to triangle HMA.”
Take a step back and look at your own process. Before anyone could react, Su Chengyi changed the chalk to another color.
“3. Draw the midpoint N of BC and prove that triangle CNQ is similar to triangle ABC.”
"To calculate NQ/NC, I currently have two methods."
After this operation, everyone was stunned.
But for Su Chengyi, this is just the beginning.
"Four. It can be proved that circles ADP, AB and QC have common points. Here you can still choose to prove that triangles are similar, or use Ptolemy's theorem, or it is not complicated to directly calculate the AF expression by force. ”
At this point, even though his handwriting was getting smaller and denser, there was no space left on the blackboard, so Su Chengyi no longer wrote the steps, but just dictated them.
"5. Prove that JBCQ is a parallelogram."
Following his words, he changed the color of the chalk and added another stroke to the already messy picture.
"6. Prove that there are total circles."
"7. Introduce the point U and use the power of the circle."
If there were still people who opened their notebooks and took notes at the beginning, Or they are discussing in whispers, but until now, the classroom has been so quiet that there is no sound.
Everyone clearly realizes the gap between themselves and the guy on the podium. To some extent, maybe they are not the same species at all?
Zou Lian’s back molars were almost broken.
Obviously, Su Chengyi was slapping him in the face.
The key is that as the other party listed so many methods in a leisurely manner, his face started to turn red and hot, as if he had been slapped several times.
Su Chengyi could see the reason why Chu Qingmian started to solve the problem from scratch, so he suddenly came on stage when he was not ready to go on stage at the beginning and wrote so many damn problem-solving methods to mock himself.
Damn, damn it.
Han Bing had a hard time understanding even the simplest method written by Zou Lian, let alone such a large pile of sacred books written by Su Chengyi.
Although she had long known that Su Chengyi was not a mortal, she was still completely shocked like other classmates.
There is a feeling of the worldview collapsing and reshaping.
Chu Qingmian had already retreated to the edge of the podium. She had a VIP viewing seat and could see it more clearly.
Su Chengyi was obviously unprepared before going on stage. He just looked at the pictures and said whatever came to mind.
The key is that every idea he comes up with is completely correct.
Studying college entrance examination mathematics here is really an injustice to this great god.
These students were not the only ones who were shocked. Li Lu was also so shocked that she was a little speechless.
Not to mention whether she had thought of it herself, even the reference answer book in her hand did not include those methods he mentioned.
Having said all the ideas he could think of, Su Chengyi patted the chalk dust on his hands and walked back to his seat.
After he sat down and took a sip of water, thunderous applause erupted in the classroom.
“Oh my god, can you be any stronger?”
“How can I be in the same class with such a god!”
“This It’s not something a high school student can do. I suggest you go directly to the Institute of Mathematics.”
"I can't even memorize this much according to the reference answers."
Li Lu raised her mobile phone to take pictures of the words on the blackboard. She was beaming with joy. The gloomy expression on her face at the beginning of class had long since disappeared. No trace.
“Students, we can see that Su Chengyi, our classmate, has a very broad mind.
Regarding this point, the teacher wants to say, isn’t the charm of mathematics lies in its infinite exploratory nature?
I hope that his outstanding performance in this class will make the students in our class love the subject of mathematics more in addition to the requirements of exam-oriented education! ”
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(End of this chapter)