Chapter 24 It seems that the Fourth Middle School is going to be the best this year

The first time Xu You saw the question, he found the entry point to solve the problem.

"According to the condition a<|a|, it can be concluded that a is less than 0. The entire inequality is divided by a at the same time, the inequality changes sign, and the purpose of lowering the power can be achieved at the same time." Xu You thought quickly in his mind.

With this treatment, the entire inequality not only removes the absolute value, but also reduces the power to become a quadratic inequality of one variable.

Next, you can solve it with high school knowledge.

In less than a minute, Xu You calculated the answer to the first question.

And it is the speed achieved when the deep learning state is not turned on.

This is not because of anything else, but Xu You has done too many questions of this type in the past period of time.

In just 20 minutes, Xu You solved the first eight fill-in-the-blank questions.

Even the difficulty of each question exceeds the final fill-in-the-blank question of the college entrance examination.

But for Xu You now, they are just basic question types.

The quick answer to the fill-in-the-blank questions left Xu You with one hour left to answer the questions.

Let Xu You have enough time to deal with the next three big questions.

The first big question is a question about solving a triangle.

Compared with solving triangles in the college entrance examination, it also has more knowledge about vectors and basic inequalities.

But such difficulty is still too easy for Xu You.

In ten minutes, the first big question was easily solved.

The next two big questions are about functions and conic sections.

Compared with the first big question, the difficulty has increased a lot.

But within half an hour, Xu You also successfully made it.

I looked at the time and saw that there were still 20 minutes left.

At this time, some students have already handed in their papers one after another.

However, they didn't finish answering the paper, they just knew that they couldn't do it even if they just sat down, so it was better to hand in the paper in advance and go home early.

Xu You was not in a hurry to hand in the paper. After all, there was still a second test and he couldn't leave.

After careful inspection, Xu You handed in the paper on time.

After the first test, the candidates couldn't help but complain.

"I have been working on this first question for a long time. It looks like an inequality, but it is actually an inequality set of three inequalities, with absolute values."

"Why is there no multiple-choice questions in the math competition? You can't even be fooled!"

“It’s impossible to finish the paper in 80 minutes. I only wrote one and a half of the big questions and the time is up.”

Some students who were not sufficiently prepared for the competition were defeated by the first test and gave up on the second test.

The second test has not yet started, and the number of candidates in the examination room is less than half of the number of candidates in the first test.

During this period, Xu You did not communicate with any other candidates.

There are no classmates Xu You knows here, and Xu You has nothing to complain about.

After all, the difficulty of these questions can only be said to be average.

As long as you prepare carefully, you won't be able to do it without any ideas.

It's better to use these 20 minutes to take a good rest.

The second test in a while is the real test.

20 minutes later, the second trial began.

There are only 4 questions in the second test, but they are all complex and big questions.

It can be said that it is not easy to do anything right.

After glancing at the four major questions, Xu You also discovered that the difficulty began to increase significantly.

The first question is about finding the maximum value of an algebraic expression.

Xu You read the question carefully, looking for the starting point of the question.

Xu You didn't have an obvious idea at the beginning. He first deduced some conditions of the question.

But at a critical step, Xu You came to a standstill.

"By the way, use mean inequality!"

At this time, this important inequality suddenly popped into Xu You's mind.

The mean inequality, also known as the mean inequality, is an important formula in mathematics.

In high school mathematics, only a small part of it is studied: basic inequalities.

But for Xu You, who was preparing for the math competition, it was natural to be familiar with such important knowledge.

"Using the property Hn≤Gn≤An≤Qn to deform it, we can derive the optimal value of this algebraic expression!"

After some derivation, Xu You used this key property to successfully solve the entire problem.

…

Soon, 150 minutes passed.

During this period, many students gave up their struggle and chose to hand in large blank papers.

If it's a fill-in-the-blank question, if you don't know how, you can at least write down the number casually.

But for a big topic like this, if you don’t have an idea, you really can’t even get a clue.

The most I can do is write some vague formulas and pray that the marking teacher can give me some sympathy points.

At the moment before the bell rang, Xu You finally finished writing the last big question.

"Huh~ It's so dangerous, I finally finished the answer."

This time, Xu You didn't even have time to check.

However, being able to answer all four major questions in the second test was already very satisfying for Xu You.

Xu You believed that his ideas were correct, but he didn't know if there were other problems in the process.

The two invigilators were also discussing quietly after collecting the papers.

"The competition questions are indeed different. In these provincial experiments, many students from No. 1 Middle School and No. 2 Middle School also have a lot of blanks."

"Yes, this question is really not easy. I scored over 130 in math in the college entrance examination at that time, and I couldn't even understand many of the questions."

The two people looked at the name and test number of each test paper to check whether there were any missing test papers.

"Um?"

At this time, they suddenly saw a very special test paper.

Not only is the handwriting beautiful and neat, but the process of each question is also fully written.

Although there are some traces of outlining, it is precisely this that reflects the candidates' thinking process when solving problems.

"No. 4 Middle School...Xu You?"

When they saw No. 4 Middle School, both of them were a little surprised.

Although No. 4 Middle School is pretty good in Shengcheng, it is far from being top-notch.

"Do you think these processes are correct?"

"Although I can't understand it, it looks very powerful."

"Just now I saw a boy answering questions very seriously. He didn't even look up the whole time. This kid was quite charming when he answered questions seriously. He must be that kid."

"Looking at this paper, the grade will probably not be low. If it really wasn't, who would waste two and a half hours sitting here scribbling."

"That's right. It seems that the Fourth Middle School is going to be the best this year."

This time, there was no friend like Hu Shucheng waiting outside for Xu You to answer the question.

Xu You had a casual meal outside and did not go home. Instead, he returned to school.

Although I had taken a day off before, I still had noble classes to attend in the afternoon, so I couldn't delay them casually.

Xu You now has plenty of energy every day.

Even though he had just experienced a morning of high-intensity answering questions, Xu You still felt that he was in good condition after taking a break.

"Xu You, how did you do in the exam?"

Seeing Xu You coming back, Hu Shucheng ran over and asked.

"Anyway, I've made it, so I don't know if it's right or not."

Xu You feels pretty good about himself, but before the results come out, he can't guarantee how many points he can score.

"Just finish your answer. Based on what I know about you, it's basically the same. Hehe, you don't even know that all the students in the math sprint class cried when they answered, and Teacher Qin didn't even eat lunch properly."
Chapter completed!