Yang Fan just reminded him first, and didn't think about really discussing, and said: "Senior 3 classes 1 to 6, student number 1, 11, 21, 31, 41 five students, stand up." ”

There are more than 40 students in each class, and the student numbers are randomly arranged according to the letters of their names, which is very representative.

Six classes, a total of thirty people, standing.

"What is this going to do?"

"I don't understand. ”

"You are class representatives at the moment, you have the right to raise your hand and the right to speak, and everyone else only has the right to raise your hand. Got it?"

Thirty nodded.

When they don't understand, they can ask questions, and when they ask questions, they are also represented by thirty of them.

"Now, rearrange the numerical codes, there are some classmates I don't know the names at all. The one is you......"

Yang Fan pointed to the classmate closest to him in the first row, the person looked left and right, there was no one around, very eye-catching, and hesitantly pointed to his nose: "Do you mean me?" ”

"Yes, that's you. You are in the first row, counting seats from left to right, is the 5th. You're at the moment, number 105, understand?"

"Okay, I'm 105."

"I'm sorry students, because I really can't name names, and it is impossible for me to ask again and again, and test again and again, so it is not an insult to give you a number, but a temporary management method. ”

Yang Fan patiently explained, afraid that some students would be disgusted, and said: "That one, you are numbered 212, and you, number 409. ”

At this moment, there was a small noise in the classroom, the senior high school students were counting, and the teachers on both sides of the audience were discussing in a low voice.

"This student was born for math. Feng Yao has the highest understanding, and after a little thought, he understands the reason.

"Yes, yes, from managing two or three hundred people to managing 30 people, subject to random selection, it is universal and representative. Chen Changyi is not stupid, and immediately discovered the benefits.

"Now the key is, can he react all at once, the number of that student representative?"

This question is also a place where a group of adults are puzzled.

The podium is 20 meters to the last row, and if you take a roll call every time, you must first calculate the serial number of the person being named in your mind, whether it is right or wrong, it will be delayed for a long time, which will be embarrassing.

If you have this time, it is better to ask a random question, which is not necessarily representative.

"So I said, he was born for math. Feng Yao spoke boldly again.

If he wasn't sure, how could he have such a foreign appearance, thinking of this, the math teacher was shocked.

Just for a while, the most streamlined scheme was confirmed, and all the changes were organized in an orderly manner using their own powerful mathematical concepts.

"Hehe, look at it again. "The happiest person is Chen Changyi, and the open class has been recognized by all parties.

Half a minute later, there was silence in the classroom.

"Okay, let's move on to question 8. 716, I noticed that you wanted to speak several times just now, and stood up and said. ”

Yang Fan called out one person, this is a classmate of the fourth class.

The classmate squirmed for a while, with a struggling expression on his face, and said, "That old ...... Yang Fan, I choose A for this question, not B and D, can I sum up the reasons for A's error, or how to get the accurate answer to A?"

"I'm sorry, but there are only 14 people in the whole grade of A and C, in order to save time. Yang Fan said.

Principal Qu Mengxiu frowned and asked the teacher on the side: "It's really a sophisticated behavior like a machine, how can he judge that there are only 14 people?"

"Raise your hand twice and the numbers subtract. One immediately replied, and he was still complacent about his cleverness.

"Hmph. Qu Mengxiu was displeased and said, "I'm just asking, how does he judge the number of people who raised their hands twice, do you understand." ”

This......

Dozens of people raised their hands, with different heights and amplitudes, and some students blocked their sight with their heads, and they came over one by one, and it took ten minutes to say the least.

"That's a lot of computing power. ”

"Just a glance?"

"It's terrible, it's terrible. ”

No one understands that everything Yang Fan sees can be transformed into data.

He was very calm, pressed his right hand, asked the student to sit down, and said, "Next question, choose D. Raise your hand." ”

Less than 15%, too.

On the podium, one question after another, according to the proportion, when it exceeds 20%, he will use about 30 seconds to speak, and if it exceeds 50%, it will take four minutes.

"Half of the people are wrong about this question. There's a trap here, you think you're right, but you're still missing the last step......

"What does the questioner mean here? He deliberately made the amount of calculations that would have taken two steps into five steps, so that you have to follow his rhythm......"

The lecture hall was always quiet, and the only sound that echoed in the classroom was from the podium.

"Efficiency, calculation, coldness. I can figure out why the province is the first. Chen Changyi's voice was very low, he was afraid of disturbing the students' listening at the moment.

"Don't waste a single amount of time, you can cover twice as much content in one class. ”

"A mathematician by nature. ”

On the stage, Yang Fan pointed: "913, what questions do you have?"

"Please Yang Fan, repeat the previous question, I didn't understand. ”

"I want to hear it again, raise my hand. ”

156 people, accounting for 61%, passed.

"Okay, let's take a look at it again, it's a very interesting question, he reveals the information openly, and it looks like everything is laid out in the open, as long as you do the math casually, the answer is the answer. But don't forget that this question, which is the last fill-in-the-blank question, is bound to be difficult.

"Believe him is simple, and four points are lost. As mentioned earlier, thinking should be put in the perspective of the person who produced the paper, and the difficulty of the questions should be mastered, and the order of the questions should be arranged by the person who produced the paper at the first time. ”

"For each paper, the people who are out of the circle have a question bank, and the difficulty is arranged from E-S, and the last question in the major category must be above A. It's clear that it's difficult, and I'm still going to be fooled, and I'm sorry for my years of hard work. Is it possible for you to go out and not show off your IQ?"

......

The students of the third and third classes were in the fifth and sixth rows, and no one was absent. Of course, Qi Yueshu is also there.

"The gap is even bigger. The pen in Qi Yueshu's hand was meaninglessly drawn on the scroll. In the midterm exam, she ranked 25th in her class, which was lower than the middle.

"Obviously last year, almost. "At that time, I promised, but also because of the proximity, I could huddle together to keep warm. Now......

Qi Yueshu looked at Xiao Hongye, who was sitting in the front row, and the latter really didn't do anything, holding his chin with both hands and looking nymphomaniac.

On the side of Xiao Hongye was Yuan Wenbo, who poked the fingers of the other side with a ballpoint pen and said, "Do you have any feelings of increasing knowledge?"

Gu Changfeng was fascinated by what he was listening to, and his rhythm was interrupted, and he almost burst into foul language.

"Middle two, what are you talking about?"

"I said, Yang Fan is not the same kind of person as us. Yuan Wenbo sighed, he really couldn't keep up with the back.

"The person is still the same person, don't worry. Gu Changfeng said.

Yuan Wenbo thought about it, hey, it makes sense, the grades are hanging, and the personality is not that bird-like.

Yang Fan looked at the time, it was almost over, and said: "Let me finally say that there are only two possibilities for the difficulty of the topic." First, this knowledge point has not been learned well. This is a long-term accumulation, and there are no shortcuts.

"Second, you have been deceived by a trap. Traps don't depart from the outline, they just make the steps cumbersome, the amount of calculations increases, and it affects your train of thought.

"If you really can't do it, you can go the other way around, you can push up from the results, or you can add conditions at will to make the problem simpler, and then deduce how to get what you added.

"When one day, you can publish a similar paper, show your IQ and look at your classmates embarrassed, and you will be caught with a full breakup.

"And if there is no problem. ”

Silence, absolute silence.

A second later, applause rushed into the sky.

This night is destined to be remembered by the history of the school, and this session will become the strongest.