Chapter 22 Wolong and Fengxiao

The reason why such a large amount of calculation and thinking is required is that this problem requires the use of Vieta's theorem and the chord length formula. Then we have to judge its size, and it has to be discussed in three categories. One category is extreme points and minimum values, and the other two categories are to use inequalities to obtain the minimum value. Then use symmetry to get the results of other intervals.

After only half a minute, Zhu Hongfei and all the teachers present showed incredible expressions, and even felt at a loss.
"This this."

"We clearly designed it to be a conic section question that requires a lot of calculations, but how come it suddenly seems a little simple?" A teacher present muttered to himself, "For example, in the first question, Chen Xiaoxin seemed to know what we were testing, and the second question was even more accurate. It went straight to the heart of the question!"

All the teachers present had this feeling. The problem-solving process given by Chen Xiaoxin perfectly matched the meaning of the questioner without the slightest deviation. In fact, this question was very comprehensive and contained many traps.

Regarding the first question about the derivation of the trajectory equation, the senior math teachers had a simple idea. They eliminated those students who could only memorize the concepts. As for the second question, they first eliminated the students who intuitively thought that A was above zero, then eliminated the students who regarded K as a constant, and finally eliminated the students who were not sensitive to the absolute value function.

Then, students who cannot discuss by categories and do not know how to find derivatives are eliminated. Finally, students who cannot take the equal sign are eliminated. In short, this question can eliminate 99% of the students.

结果
Chen Xiaoxin, who should have been eliminated, wrote down the solution process of this question perfectly! It was even more concise than the standard answer!

How to do?
He already got one hundred and thirty points!
The only thing left for a perfect score is the last big question!
"Oh, I'm suddenly worried that Chen Xiaoxin will fail in the last minute and make a mistake in the last big question."

"Me too! I just hope he can get full marks! The previous problem-solving process was too perfect, perfect to the point of being impeccable. Don't leave any regrets!"

"Although... although I feel the same as you, I think... for the last big question, only Yan Xiaoxi can get all the points at the moment."

"Stop talking and ask the next question!"

As the discussion ended, everyone's attention moved to the last big question, but in less than ten seconds, everyone gasped!
he.
he knows!
He actually knows!
They are just the first two steps, and they are the simplest two steps, but in the hearts of all teachers, they are like a flag of victory, directly announcing the final outcome.

If Yan Xiaoxi played the role of a battle-hardened fighter in this question, using her accumulated experience to achieve the final victory, then Chen Xiaoxin was just an ordinary soldier who fought all the way to the end with his limited experience.

perfect
No, no!
Perfection is no longer enough to describe Chen Xiaoxin's performance in this problem. His solution surpassed the existence of perfection. He successfully solved this final question with just a few common inequalities. Everything, including the argumentation and derivation, was carried out within the rules. He started and completed within the rules.

"Conservatism" has a derogatory connotation, but here it is a positive word, because only those who have fully mastered the language of mathematics can reach such a height.

For a time,

The entire office was silent, so quiet that one could hear each other's breathing.

"Do you think Chen Xiaoxin really did this himself?"

"If it wasn't him, who else could have done it? I don't think there's another identical paper in the entire grade, unless... unless Yan Xiaoxi took the test. But you also saw that Yan Xiaoxi's solution to the last question was mixed with the shadow of the competition, unlike Chen Xiaoxin, who solved the problem completely according to the high school thinking."

"Genius! This guy is a genius! But, why was he always ranked last before? Could it be that Chen Xiaoxin was acting before?"

After heated discussions among the teachers, three preliminary conclusions were reached. First, Chen Xiaoxin is a math genius, with a math talent comparable to Yan Xiaoxi's. Second, Chen Xiaoxin's previous grades were all fake, or he deliberately scored so poorly. Finally, Chen Xiaoxin's other grades are also great. If he puts all his strength into it, he will rank in the top ten in the grade.

Zhu Hongfei did not participate in the discussion. He kept holding Chen Xiaoxin's paper and looking at it over and over again. The curve of his mouth was almost suppressed. Suddenly, Zhu Hongfei seemed to have gone crazy. He hugged Chen Xiaoxin's paper and kissed her fiercely.
If you can get one of these two, you can get the world. I didn't expect that I got them all today! With Chen Xiaoxin on my left hand and Yan Xiaoxi on my right hand, who will dare to show off their students' math scores in front of me in the future?
Looking at Zhu Hongfei who seemed to have gone insane, the teachers present were all jealous, envious and hateful. First, Yan Xiaoxi, who ranked third in the National Mathematics Competition, came. Then they discovered that Chen Xiaoxin, who had been at the bottom of the list, was actually a genius comparable to Yan Xiaoxi.

It’s all over!
In the future, no matter whether it is a joint examination for the whole school, the whole district, or the whole city, the first place in mathematics will definitely be between Chen Xiaoxin and Yan Xiaoxi.

"Cough cough!"

"I'm making an announcement here. From now on, no matter what exam it is, you will compete for the third place in mathematics. The first and second places have already been taken by my students!" Teacher Zhu, who has all the trump cards in his hands, shows his kingly style at this moment.

but.
He can only be handsome for three seconds.

He was soon besieged by his colleagues, and finally saved his life at the cost of paying each of them a cup of milk tea.

"International coal and oil prices have risen recently."

Yan Xiaoxi, who was reading a book, suddenly heard this inexplicable remark from his deskmate Wolong. He looked at him in confusion and asked, "What do you mean?"

"Don't you follow the news?"

"The situation has been tense recently. The reduction in oil production has led to a surge in oil prices, which has indirectly led to a surge in coal prices as well." Chen Xiaoxin bit the tip of his pen, his brows full of contemplation, and muttered to himself, "I can't just sit there and wait for death. New policies need to be introduced."

Not
What does the rise in coal and oil prices have to do with him?
Yan Xiaoxi couldn't understand what he was saying at all, and there was a big question mark on her forehead the whole time.

"Hey"

"Do you think that if I increase the charging fee of power banks by 50%, will it cause market fluctuations?" Chen Xiaoxin asked his deskmate.

百.
Fifty percent?
From twenty yuan to thirty yuan?
Yan Xiaoxi almost went crazy after hearing this, and at the same time she was filled with anger. These evil capitalists were so despicable!

"Why is the price increasing?" Yan Xiaoxi asked.

"International coal and oil prices have risen recently," Chen Xiaoxin replied.

"What does it have to do with you? Even if the electricity price increases, it will not change." Yan Xiaoxi rolled her eyes and said unhappily.

Facing Yan Xiaoxi's questioning, Chen Xiaoxin pursed his lips and replied earnestly: "We need to keep up with the international standards!"

suddenly,

Yan Xiaoxi clenched her fist and said coldly: "Believe it or not, I'll let you taste the fist of socialism?"

(End of this chapter)