After handing over the system, the state forced me to study

"Given a convex 20-sided shape P, divide P into 17 triangles with 18 diagonals of P that do not want to intersect inside, and the resulting figure is called a triangulation graph of P. Any triangulation of P Graph T, the 20 edges of P and the added 17 diagonals..."

Guan Lianyi habitually read the topic before explaining it.

"This question may be difficult for some students, but after listening to the explanation, you will find that it is actually quite simple."

Xu Chaoyang: "..."

There are only two people in total, and Lu Xingyao made it again, so Lao Guan, who are some of your classmates connoting?

There is no need to save my respect, you and I know it well.

"Okay, let's continue. Change the 20-gon to 2n-gon, and consider the general problem. For a diagonal of a convex 2n-gon P, if there are an odd number of vertices of P on both sides, it is called odd chords, otherwise called even chords. Attention first to the following basic facts..."

The tutoring time in the evening seems to be very long, but in fact, it is only a flick of a finger after serious study.

The reason why Lu Xingyao likes to participate in Guan Lianyi's tutoring is that Guan Lianyi will link various knowledge points when explaining. Although Lu Xingyao can also do it, if he thinks about it alone, it is inevitable that there will be some omissions. This requires Guan Lianyi's persuasive guidance.

The second is that Guan Lianyi, a senior, has been researching the exam questions for many years. When explaining, he combines the direction of the question, the thinking of the questioner, and the key points of the answer, which is much better than Lu Xingyao alone.

It's not that he doesn't want to ask the study support group, the problem is that none of the people in it are experienced in connection, not to mention that Lu Xingyao is well versed in the principle of rational use of resources.

In the high school study career, studying took up most of the time. In fact, in key high schools like Jiang City No. [-] Middle School, dramatic incidents rarely happened, and more of them were steady progress, which was not much different from previous years.

"Lu Xingyao, answer this question for you."

Math teacher Chen Cheng adjusted his glasses and called Lu Xingyao up with a serious expression.

Lu Xingyao was actually very confused, because at the moment he was called, he was doing a little trick - looking at the topic of the math competition.

Just as he had a glimmer of inspiration for a difficult problem that had troubled him for a long time, Chen Cheng named him.

The conditioned reflex of being called made Lu Xingyao stand up with a "swish", and his movements were agile, as if he was not the one who didn't attend the class just now.

The reason for this desertion in math class has to start with Guan Lianyi's return.

Guan Lianyi's return from a business trip not only brought Lu Xingyao one step closer to emptying out the accumulation of old customs, but also made him realize that he was pressed for time.

The preparations for the school sports meeting took him more than half a month to train. He was extremely tired every day, and he didn't even notice that his reading speed slowed down. If Lao Guan hadn't come back in time, I'm afraid...

Thinking about the national league that started in less than two months, and thinking about the time he spent learning math competition knowledge, Lu Xingyao felt a little bit of fear.

No, in order to make up for his previous mistakes, Lu Xingyao brought his little idea to math class, but he was caught by the sharp-eyed math teacher Chen Cheng.

In the final analysis, it is also because the mathematics in other classes is too obvious. Once you scan it, the content is obviously different.

No, it's all about the system after all.

Thinking about it, Lu Xingyao scolded the system when he grabbed the dangling system.

"Smash~"

"What's up~Host?" The system just finished watching an anti-war drama, and the blood was surging, and the mood was extremely good, and the voice that answered Lu Xingyao had a slight ending.

"It's all your fault." Lu Xingyao said angrily.

The system is puzzled: "?" What did I do again?

"Fuck off."

Can you really bear it?This is simply intolerable.

The system used its quality as a high-tech system to quickly search for various words of "consolation" to Lu Xingyao.

After finally stopping, he found that Lu Xingyao's face didn't change. Looking at his hands, he didn't clenched his fists. They were still drooping naturally and relaxed.

what happened?Could it be that the host has thickened his skin?Or is the endurance higher?

The system is puzzled.

In fact, in order to avoid being scolded by the system, Lu Xingyao specially used the newly discovered function - shielding.

Spraying with the system in my mind, scratching my head in reality.

It's over, what question is Lao Chen talking about?

He touched his silent deskmate with his hand, hinting him to remind him.

The deskmate silently moved the book further away from himself, moved his fingers slightly, and pointed to the podium.

Lu Xingyao raised his eyes quietly, "!"

Old Chen, don't look at me so eeriely, I'm afraid.

You said you were such an amiable little old man when you were smiling, why did you make that expression?Like a vicious villain.

"Twelve questions on page 57 of the workbook."

Chen Cheng took a deep look at Lu Xingyao, glanced at the exercise book in his hand, and still gave a hint.

Oh, it's over, I didn't take out the exercise book.

As soon as he heard the words "workbook", Lu Xingyao knew he had been exposed.

Lu Xingyao pretended to be very calm, but actually took out the math exercise book from the bookend on the desk in embarrassment. Little did he know that his classmates had already seen through his disguise.

The moment Lu Xingyao was called, from Lao Chen's dark face and indifferent tone, the students felt something was wrong sensitively.

They all looked sideways, and the target of their sight was the famous Lu Shen at the penultimate table in the first group.

After opening it, Lu Xingyao fell silent.

Oh, he can answer this question.

Isn't it just a function, he is best at it.

Lu Xingyao smiled happily, and answered Chen Cheng's question seriously.

After the answer was over, the voice fell, and Chen Cheng said calmly, "Well, sit down."

Lu Xingyao sat down as he wished, but he didn't dare to lose his mind.

As soon as Chen Cheng's exercise book was placed on the table next to him, he didn't explain the topic immediately, but said some digressions rarely.

"We are now in the second semester of the second year of high school, and half of the semester is over. At the end of the semester, your identities will be changed to quasi-senior seniors. In order to review for the third year of senior high school, we will learn everything that should be learned during this semester, including the use of summer vacation time. over."

"I know that everyone has a lot of activities now, such as school sports games, math competitions, etc., but you have to be clear that the results of these competitions are unknown. Maybe getting good results in some competitions can allow you to directly sign with a good university , but I still say that, the result is unknown.”

"The results of the preliminary competition don't mean anything. The difficulty of the questions will increase step by step, and the number of people who advance will decrease step by step...Study hard and prepare for the college entrance examination seriously. Can it be made up?"

"By the time you make it up, the other students have already jumped out of this category and started a new learning goal..."

From the moment Lao Chen put down the book and opened his mouth, Lu Xingyao had a premonition that he might say something.

Sure enough, Lao Chen talked a lot as he expected.

Lu Xingyao also listened silently, lowered his head and began to think about his recent actions.

Perhaps it was because of the system's help that made him a little bit flustered. He always thought that he would be able to make up for what was left behind, but one day he would eventually use up the potion of concentration, and the system's tasks were not static. Who knows when the system will go crazy and ask him to complete it What about tasks that have nothing to do with learning?

What Old Chen said was very reasonable, and Lu Xingyao really listened to it. After digesting it, Lu Xingyao changed his recent study plan.

The main performance is to listen carefully in class and actively prepare for the national league after class.

As for being depressed because of Lao Chen's instructions, which are very obvious, that is impossible.

Who is he, the little prince of sunshine, Lu Xingyao?

Depressed or something, all retreat.

retreat!retreat!retreat!