"What the hell? You're almost a sophomore in high school? Are you kidding me? You're almost a sophomore in high school, and you don't even know what books to read to participate in the competition. My suggestion is don't take the exam. Keep your confidence and go to the high school exam.

The rules for recommended admission will be changed next year, so even if you are lucky and save one in the exam, it will be of no use."

"Upstairs, you don't have to join the provincial team to participate in the competition, get the first place in the province, or even the first place in the country.

The poster has finished studying the high school mathematics content in his first year of high school, and there is still a summer vacation. If he takes advantage of this time to study hard, he hopes to get a second or third grade."

"If the author has no competition experience before and doesn't know much about competitions, I suggest you buy a set of "Olympiad Math Tutorial" to get started."

"Welcome another newcomer to the digital competition."

“Recommend the little blue-skinned Aojing.”

…

Soon, people began to reply to Zhao Xiancai’s post.

Zhao Xiancai was also very happy after seeing many people replying to his posts. He did not rush to reply to them, but looked at other posts in the "Mathematics Competition Bar".

"I don't know how to solve this question. I can find the general formula of {an} in the first question, but I don't know how to find the general formula of {bn}..."

After Zhao Xiancai checked his cell phone for more than half an hour, Yu Shujun asked him a math question.

"Let me take a look." After saying that, Zhao Xiancai looked at the question Yu Shujun asked.

"It is known that a2 and a5 are the two roots of the equation x2-12x 27=0, the sequence {an} is an arithmetic sequence with positive tolerance, and the sum of the first n terms of the sequence {bn} is Tn, and Tn=1-(

1/2)bn(n∈N*).

(1) Find the general formula of the sequence {an}, {bn};

(2) Remember cn=anbn, find the first n terms and Sn of the sequence {cn}..."

After reading the question once, Zhao Xiancai began to tell Yu Shujun the solution to the question without thinking.

In fact, this is the benefit of Zhao Xiancai's question-sea tactics. Like the question Yu Shujun is asking now, if Zhao Xiancai encountered it while doing the questions, he would not even start writing after reading the questions.

Because he is already very familiar with this kind of question, and it will be ineffective to study it again, so he will skip it directly after reading the question.

"...Look, doesn't it follow that Tn-T(n-1) means bn=(1/2)b(n-1)-(1/2)bn? Now we have bn/b

(n-1)=1/3(n≥2), you can find bn=……

In this way, the general formula of the general formula of {bn} comes out.

The second question is to find the first n terms and Sn of {cn}. The method is actually the same as finding the general term formula of {bn}.

Now that you know how to find the general term formula of {bn}, you can find it yourself and look at the sum of the first n terms of {cn}."

After explaining to Yu Shujun the formula for finding the general term of {bn} for the first question, Zhao Xiancai asked Yu Shujun to write the second question by herself.

After hearing what Zhao Xiancai said, Yu Shujun began to write the second question with some anxiety.

“cn=(2n-1)*2/3n=(4n-2)/3n……

I figured it out, and finally found Sn=2-(2n 2)/3^n."

After a while, Yu Shujun said excitedly.

"Let me see."

With that said, Zhao Xiancai took a rough look at Yu Shujun's problem-solving process.

"Yes, you see, many mathematical methods are similar. Although the second question is different from the first question, the methods are indeed the same..."

Zhao Xiancai said a few more words to Yu Shujun. After finishing speaking, he continued to browse his mobile phone.

By the evening, after Yu Shujun left here, Zhao Xiancai's phone was almost full.

Although some friends in the forum said that it was impossible to make a book list for the mathematics competition, Zhao Xiancai still collected a lot of book titles.

The first is to get started, you can buy "Olympiad Math Tutorial" or "High School Mathematics Competition Training Tutorial"

After that, you can read the Little Blue Paper, Olympian Classics and Questioning Man series, national competition test questions, secondary mathematics, etc.

This "little blue book" refers to the nickname of "Mathematical Olympiad Little Series", also known as "Little Series", which has junior high school papers and high school papers.

The reason why it is called "little blue" by many contestants is because its cover is mainly blue.

The "Olympian Classics" refers to the "Olympian Classics".

…

I have to say that there is quite a lot of information, and not all of it should be read. Netizens recommend using it in combination.

Maybe this company's data inequality is the best, and that company's data circle is the best. When you don't need to buy a certain company's data, you buy the whole set.

"When this vacation is over, I have to discuss the materials with the class teacher again and see which ones to buy."

Zhao Xiancai also looked at the competition book he had written down and thought about it in his mind.

Naturally, he hopes to buy all these materials. Even if he will not read all the test questions and repeated knowledge points and methods in these materials, the questions he skipped must be those he later thought he had mastered.

There is no need to review the questions again.

However, some of the information here comes in complete sets, and a set costs at least several hundred.

If he really wanted to buy them all, Zhao Xiancai estimated that the price would be several thousand.

Although Fang Qiu said that the school would reimburse him, Zhao Xiancai felt that he did not expect to spend so much money to buy the information.

"Fortunately, I found a lot of electronic materials online this time. Physical printing shops outside are too expensive. I can find some printing shops online later and have them print them and send them over.

There are no math problems to write now. There are still two days until the holiday ends, but I can do some biology and chemistry problems first.

Also, I haven’t finished the questions I bought from the system with my points. In the future, the time spent on mathematics will be reduced a lot, so these two days won’t be too boring.”

Zhao Xiancai began to think about his follow-up plans again.

Two days passed by in a hurry. During the first evening self-study after the holiday, Zhao Xiancai found his class teacher.

"Hey, your list of books is quite long. Can you finish reading so many books?"

After Zhao Xiancai found Fang Qiu, he briefly told him about the mathematics competition books and showed Fang Qiu the list of books he had made.

Fang Qiu was also shocked when he saw the long list of book titles listed by Zhao Xiancai.

"No matter how much I learn, I can finish it."

Zhao Xiancai said quite confidently.

"Well... if you buy so many books at once, the school probably won't reimburse them all, and can only choose to buy some."

After hearing Zhao Xiancai's affirmative answer, Fang Qiu felt a little embarrassed.

After all, what he and Zhao Xiancai had said before was that the school would reimburse the books for participating in the mathematics competition.

“I wonder how many books the school can reimburse?

This "Math Olympiad Tutorial" and "Math Olympiad Small Series"...you can buy them first."

Zhao Xiancai said while pointing to the piece of paper in Fang Qiu's hand.

"Well, I asked some colleagues and friends about these books during my vacation these days, and they also recommended these books.

There are at least six or seven of these books in one set, so let’s buy four sets first, and there will be twenty or thirty books in four sets,” Fang Qiu said.
Chapter completed!