"Brother Nian, hurry up and protect me!"

"Brother Kuan has spoken, so we will have to rely on Brother Nian to protect him in the future."

“That’s it…”

Seeing this, Liu Nian waved his hand, raised his head slightly, and his face was filled with understatement: "It's easy to say anything."

As soon as he finished speaking, Li Yong and others started to laugh.

"Okay."

"I'll look for the topic first."

"Take an exam now, and you can raise it up anyway."

“…”

The few of them said it with great pleasure, but did not take any action at all.

If you can "fall" to the back seat, you will have already understood how much you weigh.

The senior high school of No. 2 Middle School officially started in early July last year, instead of September last year. It has been 7 months since then, and has had 7 large-scale monthly exams, not to mention the small exams every few days, so I can jump up early.

Li Yong, Zhang Haibiao and others knew that they could pass the second-tier exam at most, so it would be impossible to go up.

The knowledge in high school has a certain depth. Some contents are not available, and even if you are forced to do it, you will not know how to do it.

Especially 329 is a science class.

Such as chemical balance, physical electromagnetic induction, mathematics... forget it, it's okay not to talk about it.

but,

Zhou Kuan is different. He really needs Liu Nian, a person with outstanding academic performance, to give him some lessons.

Although not the best, it is at least the most convenient.

Zhou Kuan knew that he had to recognize that he had truly graduated from high school for 12 years, and after going to college, some of the knowledge in high school was almost no longer used, especially the three subjects of matter, transformation and biology;

During the eight years of work, my knowledge system gradually evolved into a screw-like skill.

Therefore, Zhou Kuan will list the stage goals in categories.

Strictly speaking, Zhou Kuanxin knew that it was risky to make mathematics the first small goal;

Because in a popular sense, mathematics is the most difficult subject.

But Zhou Kuan was also looking through all the textbooks, only the decision made after reading mathematics.

So, after Liu Nian and the others started to make a fuss, Zhou Kuan took out a marked math test paper, picked out a question and asked Liu Nian: "A Nian, tell me how to do this question."

"Fill in the blanks..." Liu Nian took a random look at it first, then his face gradually became serious, "I think about it."

Mathematics fill-in-the-blank questions are very interesting.

For example, there are two simple test papers that Zhou Kuan took out. Zhou Kuan knew the answer without using formulas.

The more difficult fill-in-the-blank question in Zhou Kuan’s understanding is the most difficult in this paper, which is a little more difficult than the last big question.

The topic is:

"Split a regular triangle ABC into n2 congruent small regular triangles;

n≥2,n∈N;

Place a number at each fixed point of each triangle, so that the three sides of the large triangle and any straight line parallel to a certain side (when the number of numbers is not less than 3) are respectively formed into an arithmetic sequence;

If the three numbers at vertices A, B, and C are different and the sum is 1, and the sum of the numbers on all vertices is f(n), then f(2)=2;

Finally, find: f(3) and f(n).』

This question looks a little painful.

Zhou Kuan is also a person who wants to save face. He thought he could not just find something he didn't know, so he found the one he thought was the most difficult.

To be honest, Zhou Kuan was completely sure that he would get the answer correctly in this paper by less than 30%.

At least Zhou Kuan used almost every minute of the third lesson that just passed. Except for simply sorting out the other few, he spent all his time sorting out mathematics.

Liu Nian worked at the desk for a long time, and wrote one draft after another. Finally, he made it, and he felt relieved.

"I just said Brother Kuan would ask me for advice. This question is really tricky. I remember that the teacher seemed to have said it, but if he did it again, his mind would be too big."

He first said nonsense, and then Liu Nian began to explain: "Brother Kuan, look, from the question, I know that this is a problem in the test sequence."

"We need to solve the values ​​when n=2, 3, and 4 according to the arithmetic middle term method, and thus summarize the value of f(n) in the second question."

"First find the value of n=2."

“…”

"First look at the figure in the question stem. According to the characteristics of the arithmetic sequence, you can obtain A+B=2D...;

Therefore, f(2)=3×4÷6=2, which corresponds to the known."

"Then the same calculation can be obtained, f(3)=4×5÷6=10/3."

“This is the answer to the first question.”

“…”

“f(4)=5×6÷6=5.”

"Finally, let's summarize this process and we will find that f(n)=(n+1)×(n+2)/6."

The whole answer is also very long, and it sounds like a bit brain-burning.

But Liu Nian is like solving the problem for Su Xiaoxi, not only giving answers, but also giving the idea, steps and methods of the problem.

I have to say that although Liu Nian is a little bit sexy and likes to show off, her learning ability is still very good.

At least Zhou Kuan has not found any idea on this topic.

Although Liu Nian took some time, he still knew the reason and why.

"I understand."

Zhou Kuan found that he could understand and understand after listening to it, and was a little surprised.

After a little measurement, Zhou Kuan did not spend his time on consolidating similar questions, but instead used the remaining time to ask Liu Nian for advice.

I figured out the most difficult questions on the first test paper he took out.

There are exceptions.

Finally, there was a question, but Liu Nian couldn't fully understand it. Su Xiaoxi looked at it on the side, saying that he could do it according to the answer, but he couldn't explain it.

Zhou Kuan marked it up without forcing it.

Through this process of asking questions and answering questions, Zhou Kuan further divided his strengths and weaknesses in the subject of mathematics.

The strength is 'probability statistics', and Zhou Kuan can basically look at this thing.

As for the algorithm part of the strongest point... it is not the focus of the college entrance examination, Zhou Kuan found that it was extremely rare when he sorted out the test papers.

Liu Nian and Su Xiaoxi also mentioned that if you want to take the exam, you will get points.

The weakness is a trigonometric function.

Zhou Kuan himself didn't expect this because he forgot the formula.

Derivatives and vectors are also relatively weak.

On the contrary, there are some aspects such as "sequences" and "functions" that Liu Nian and Su Xiaoxi think are relatively difficult. Zhou Kuan thinks it is not very difficult. Basically, he will understand it just by listening to Liu Nian once.

so……

Taking advantage of the time after lunch, Zhou Kuan casually took out a paper from his pile of books and started to do it - anyway, he has a lot of blank test papers now.

Moreover, Su Xiaoxi and his team's test papers are full of answers, and they will be given a reference after they are finished.

Nothing else, these test papers were sent out and explained by the teacher, but Zhou Kuan didn't listen.

The third year of high school is originally a process of reviewing, doing test papers, exams, reviewing, doing test papers, and exams.

The fifth class was almost over, and Zhou Kuan finished all the questions he knew on this test paper.

I also encountered a similar series problem, which took a little time to calculate, and the others were OK.

This class is biology, and the teacher is the youngest female teacher in all subjects. She has only been working for more than three years, and her majesty is slightly poor.

For example, Liu Nian was listening to the class for a minute, and was fiddling with her mobile phone.

Su Xiaoxi is a little better, but he doesn't hear much.

Seeing this, Zhou Kuan did not hesitate and greeted Su Xiaoxi in a low voice: "Xi Mengzi, help me find this test paper, I'll check the answer."

Su Xiaoxi looked at the test paper on Zhou Kuan's hand and glanced at Zhou Kuan: "You didn't do this... it's too..."

Then he said, "Hey, I can't see clearly."

When the bell rang for get out of class, Zhou Kuan just finished the answer.

Su Xiaoxi deliberately glanced at Zhou Kuan: "How much?"
To be continued...