Seeing Liu Hai walk into the classroom, the four people who were originally chatting immediately quieted down.

Liu Hai walked up to the podium with a smile, put down the suggestion lesson plan he had written, and said unhurriedly: "My name is Liu Hai, and I will be the instructor of your group for the next two months, you should all know me, so you won't introduce yourself too much, or you should introduce yourself first." ”

Although Liu Hai was younger than the four students present, Liu Hai is now an associate professor at the school, and their instructors, including Zhao Lixin, did not dare to slack off, and got up one after another to introduce themselves.

In addition to Zhao Lixin, a fifth-year student in the Faculty of Science, there is also a fourth-year student in the Faculty of Science, Hu Qiang, and the other two are Wang Ming and Qi Donglai, a fourth-year student in Dan Pharmacy, of which Wang Ming is the only female student among the four.

Liu Hai asked them about their usual academic performance, and they were all good, among which Zhao Lixin and Wang Ming were the best, both of whom had published papers in the sixth-grade local academic journal.

Among the four people, in addition to the two from the College of Science, Wang Ming and Qi Donglai from the Dan College of Pharmacy have learned science well.

"Okay, without further ado, let's start classes now. Liu Hai went straight to the point, and said: "First of all, let's talk about your study outline for the next two months, which is divided into three stages, the first stage is to explain the questions, the second stage will be experimental design and experiments, and the third stage will be paper ......writing."

"Because it's a time-limited closed competition, as a team, you have to learn to divide and work together, understand each other's strengths, and in the next two months, I will assign a lot of contact tasks, and it is best for you to allocate your respective positions during the game at this stage......"

Liu Hai said the study outline, put forward some learning requirements, and then stepped into the topic: "Now let's start to explain the opening of the questions, everyone has a collection of real questions from the past few competitions, right?"

"Professor Liu, everyone has this. Zhao Lixin replied first.

Zhao Lixin sat in the audience, his mood was complicated at first, the teenager on the podium last time was his own junior, but now he has become a professor who teaches himself, no matter with Liu Hai's lecture, he has adjusted his mentality.

And he is very happy, among the four people, he is actually the most looking forward to Liu Hai, the ancestor of applied science, to be guided.

"Then take it out, let's look at the topic of the last session. Liu Hai waited for a while, and then continued: "Your combination is a combination of science and pill medicine, so we don't look at other topics, just look at the questions about pill medicine in it, and then start to solve the problem from the perspective of applied science." ”

"Teacher, it seems that this problem cannot be solved from the perspective of science, we have thought about this problem before, but we really haven't figured out how to use mathematical tools to solve it. Wang Ming raised his hand and asked.

The four of them have been training as a team for a while, and the past papers are the best training questions.

Bangs waved his hand, signaling a little restlessness.

"Is it really impossible to solve the problem from a physical point of view? Let's look at this problem. Liu Hai began to read the title: "There are ten kinds of raw materials for refining No. 1 powder, and the eight known ones are purple primrose, withered vine, and white shadow stone...... , Q: The two raw materials selected at will, how many kinds of No. 1 powder can be configured, please give a specific configuration prescription. ”

Reading the question, Liu Hai began to solve the problem: "Many people look at this topic, they know that this is an open topic, there are countless medicinal materials in the world, and there are two unknown medicinal materials, so these two can have countless collocations, so I think it is impossible to use the tools of science to calculate how many No. 1 powders, right?"

"Teacher, isn't it?"

Liu Hai smiled and said: "Of course this is right, but you have to see what the real purpose of the questioner of this question is, the questioner does not really want you to calculate how many kinds of No. 1 powder, his purpose is to hope that the contestants will give as many Danfang plans as possible with specific configuration of No. 1 powder." ”

Liu Hai said this, and began to turn around and write on the blackboard, and at the same time explained: "The advantage of applied science is that you can calculate the optimal solution according to the known conditions, even if the optimal solution is not concrete, you can also get an optimal solution to the true answer...... If we want to have applied physical thinking, we must learn to build physical models based on known conditions......"

Bangs board the known conditions of the problem: "Your first lesson is to learn to break down the known conditions of the problem. ”

"Taking this topic as an example, the known conditions are: 1. The final drug is a powder, 2. The raw materials are 10 kinds, 3. The names and quantities of 8 of the raw materials and medicinal materials, 4. The 8 raw materials of the known weight plus two unknown amounts of medicinal materials can be configured into a powder......

"This is the first decomposition according to the question, and it is the most direct decomposition, so can we make further decomposition on this decomposition? The answer is yes, let's look at the first and third decomposition ......."

"First, the final drug to be obtained is a powder, so what characteristics does the powder have that can constrain the range of the two unknown medicinal materials......?

"Article 3, if the names and quantities of the eight raw materials are known, can these eight raw materials be calculated separately from the five elements of the medicinal properties of the medicinal materials, if as a whole, the composition of the medicinal liquid refined from the eight raw materials ......"

The following four students listened fascinated, and Liu Hai said everything they had never heard of.

Bangs from the decomposition of the known conditions of the subdivision of the topic to the point of outrageous, and this decomposition is not aimless, all decomposition has a purpose, that is, the number of as far as possible to restrain the unknown two medicinal materials, then there is no direct effect, but also through some methods, play an unknown role.

Of course, there are some things that don't work for the time being, and we have to break them down.

Liu Hai didn't talk about anything else in the first class, only how to break down the known conditions in the question, and throughout the morning, he took four students to break down five real questions in a row.

"Okay, let's break down these five real questions today, after class, you have to follow the method I talked about today, contact yourself, before our next class, at least ten questions, then I will check, by the way, the reason why we decompose the questions so delicately, its purpose is to build a science model that can lead to the answer, these known conditions are the bricks and tiles that we build the science model, the more bricks and tiles, the more solid the science model we build, and the closer it will be to the answer, so you must pay attention to the content of this class and go back to practice……”

The students below nodded their heads again and again, and after a lesson, they had been completely conquered by bangs.

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