After filling in the volunteers, Chen Zhou finally became a lot more relaxed.

Except for the days when he got the admission letter, Lao Chen's family was very lively.

In addition, there are occasionally some local media to interview, and the rest of the time, Chen Zhou can finally devote himself to studying.

In addition to high mathematics, Chen Zhou also purchased the physics and chemistry textbooks mentioned in the two tasks that he did not choose at that time.

Physics: He bought the first and second volumes of "University Physics" (Mizuki University Edition) with the task description.

He found chemistry textbooks on the Internet, and finally chose the first and second volumes of Inorganic Chemistry (Fourth Edition) (prepared by the Department of Inorganic Chemistry of Tianda) and Basic Organic Chemistry (Third Edition) (Higher Education Edition).

Chen Zhou plans to learn advanced mathematics on his own while also reading physics and chemistry textbooks.

In terms of time, he is not worried, although the high number of tasks limit the use of psychotropic drugs, but physics and chemistry, it is still possible...

As for why I bought a new book this time, instead of borrowing it from my seniors or seniors.

That's of course because the bonuses in all aspects are really too generous, and Chen Zhou once again experienced the feeling of getting rich overnight after the spirit medicine.

Chen Zhou was even thinking that if he took the college entrance examination a few more times, it would not be a dream to buy a house or a car...

While Chen Zhou is studying advanced mathematics, large objects and inorganic and organic chemistry, Yang Yiyi is also teaching herself advanced mathematics and large things.

Yang Yiyi originally chose the high mathematics textbook of Yanda version, but seeing that Chen Zhou chose the sixth edition of Tongda, she also changed it to the same university version.

Although the versions are different, the knowledge is interoperable.

And now I have studied the same version by myself, and when I start school, I can learn the Yan version again, which can also play a role as a comparison.

Chen Zhou studied high mathematics in the morning, and large physics, inorganic and organic chemistry in the afternoon.

Yang Yiyi is the opposite of Chen Zhou, she learns big things in the morning and high mathematics in the afternoon.

This is to keep the pace the same so that two people can learn in sync.

Chen Zhou learned how much high mathematics in the morning, and Yang Yiyi learned how much in the afternoon.

Similarly, how much Yang Yiyi has learned, Chen Zhou has also learned.

Of course, because of the psychotropic medicine, Chen Zhou will switch to the textbook of chemistry after he keeps up with Yang Yiyi's progress in the study of big things.

Then, in the evening, the two of them verified their mastery of the knowledge points through the exercises in the textbook.

For topics that don't know, the two of them ask each other for advice and discuss with each other.

If you don't understand it, look it up online.

However, it is rare that there are very few basic textbooks such as high mathematics and big things that no two people understand.

In this way, every week from Monday to Friday, two people urge each other, learn from each other, and make progress together.

Then, reward yourself with a weekend.

However, Chen Zhou's weekends are basically used to tutor his uncle's cousin and his younger brother Chen Xiao.

I don't know if it's Chen Zhou's delusion, he found that the two children seemed to have become more attentive to learning.

Especially his younger brother Chen Xiao, who used to only know how to play during the summer vacation, but now he has begun to read books by himself.

Chen Zhou was still very pleased, he remembered what Zhang Yifan said that a person's change would affect a group of people around him.

With the deepening of time, advanced mathematics was finally turned to the last section by Chen Zhou.

Section 8, Fourier series of general periodic functions. ”

"1. The Fourier series of a periodic function with a period of 2l..."

“... Let the periodic function f(x) with a period of 2l satisfy the conditions of the convergence theorem, then its Fourier series expansion is f(x)=......"

“... When f(x) is an odd function...... When f(x) is an even function..."

“......”

Chen Zhou held a pen and wrote on scratch paper while following the theorems and proof methods in the textbook.

After reading this part, Chen Zhou put aside the textbook and glanced at what was written on the scratch paper.

Then put down the scratch paper and start reading the example questions.

The sample questions are very simple and not difficult.

According to the previous theorem formula, substitution and derivation are sufficient.

After the sample questions, Chen Zhou came to the last content of the textbook.

"*II. Plural forms of Fourier series"

When Chen Zhou saw this small part of the content, it was still marked with an asterisk, and he was immediately interested, and the finale should be a little more difficult.

It took Chen Zhou a moment to straighten out the plural form of the Fourier series.

In general, the two forms of Fourier series are essentially the same, but the complex form is more concise and uses only one equation to calculate the coefficients.

Then there are the example questions that are not difficult.

The example questions are followed by exercises 12-8.

Chen Zhou stopped, and waited for the evening to solve the exercises with Yang Yiyi, and by the way, he was faster than anyone else.

After glancing at the time, before the meal was served, Chen Zhou took out the next volume of "Basic Organic Chemistry".

There are the most chemistry textbooks, and Chen Zhou also spends the most time.

After eating at noon, Chen Zhou took a nap for half an hour and was woken up by Yang Yiyi's call.

When the afternoon study time came, the two of them began to study on their own.

The study of the textbooks has also come to an end, and Chen Zhou has allocated more time to the study of chemistry textbooks.

It's not been long since I left school, and I have to complete the goals I set before the start of school.

In the evening, it is time for exercises.

Chen Zhou took out the high mathematics textbook and said to Yang Yiyi to start.

He picked up his pen and set about working on the rest of the exercises.

In addition to the exercises in the last section, there is a general exercise for the whole chapter.

The amount of questions is okay, but in terms of difficulty, only in the last section of the exercise, there are two questions with an asterisk.

Chen Zhou quickly solved the 1 and 2 questions in order, and then began to do the first question with an asterisk.

"Let f(x) be a periodic function with period 2 and its expression on [-1,1) is f(x)=e^(-x), and try to expand f(x) into a Fourier series in complex form. ”

Chen Zhou thought for a while and began to write on scratch paper: "If the function f(x) is continuous at x≠2k+1, k=0, ±1,±2, then Cn=1/2l∫......=sinh1· (-1)^n· (1-nπi)/(1+(nπ)²)。 ”

Chen Zhou checked the calculation process, well, there was no problem, plus the sum of -∞ to ∞, and it was done.

"Therefore the complex form of the Fourier series of f(x) is f(x)=sinh1......"

This question is solved, and the next question is solved.

The only one with an asterisk.

After reading the question, Chen Zhou thought about it for a while and began to solve the problem on scratch paper.

It takes a little more time, although this question is more difficult than the previous one, but the knowledge points are clear, so it's so-so.

There is still the general exercise section of the last chapter.

Chen Zhou quickly solved all the problems, and then gave Yang Yiyi a yes~

Yang Yiyi looked at the last question left, and pouted, "Hmph, you won." When I'm done, we'll be better than physics!"

Chen Zhou saw Yang Yiyi's expression and laughed happily.

Yang Yiyi lowered her head and continued to do the question.

Chen Zhou took out a set of wrong questions and prepared to verify the answers.

However, before he could open the wrong question set, the voice of the system sounded in his head.

"Congratulations to the host, complete the task, mathematics is the foundation, and the foundation must be laid!"

Completion: The host has completed the relevant knowledge of the second and second volumes of "Advanced Mathematics" (6th edition of the same university) by self-study. ”

"Completion time: 10 days before the start of the semester at Yenching University. ”

"Get Reward: 1000 Natural Science XP. ”

"The task has been refreshed, please ask the host to claim a new task by itself. ”