I really don't want to lie down and win

perfect!

so perfect!

It turned out to be exactly the same as my own answer, not even a single symbol was wrong.

Seeing that Xu Mang solved his problem smoothly, Professor Xie couldn't help but say, "Okay! This colleague has done a very good job..."

In the middle of the conversation,

Xu Mang came to the two blackboards that could move up and down, and continued to write the process of solving the problem, but his weird behavior made many people a little confused. He had already solved the problem, so why was he still writing?

This...

What is this doing?

Professor Xie was about to open his mouth to speak, but the next second when the words came to his lips, he held back abruptly.

Center of mass translation reference frame?

This is...

The second solution?

Professor Xie was stunned for a moment. There is indeed a second solution, and it is very convenient, but it is not suitable for freshmen. He... how could he?

impossible!

at this time,

Professor Xie became more and more curious about this student. He stimulated himself again and again to refresh his understanding of freshmen. Is he really a freshman?Or did juniors, seniors, or graduate students come to make trouble?

3 minutes,

All the students present witnessed the birth of a miracle. There seemed to be two completely different solutions to Professor Xie's problem, and the person who did it was the bronze player who had fallen asleep in class before.

"I rely on..."

"Who is this guy? Why haven't I seen it?" A certain student present asked with a puzzled face: "Have you seen him? Wearing such earthy glasses... There is no trace of youth at all." , and...how do I feel twisted when I see his lazy look. "

"Yup!"

"But their ability is higher than ours." The boy beside him sighed: "There is a lot of pressure... If I have the same talent as Professor Xu, it would be great."

"Ha ha!"

"You're thinking about farts!" The boy mocked with disdain, and then continued to look at the blackboard. During the second problem-solving process, he found a problem after looking at it. The boy suddenly felt that the back of the student who answered the question seemed to be Where have I seen it.

This back...

So familiar!

"..."

"Did I have hallucinations?" The boy said cautiously: "I... I think his back looks a bit like Professor Xu!"

"You're talking nonsense!"

"Before you thought that your girlfriend's back looked like a certain female star, and it was because of this relationship that you were with others. I saw...it looked like a fart!" The boy next to him said angrily: "Xu The professor is busy, how could he be so boring? He has a lot to do every day!"

"Too!"

After a few more minutes,

Xu Mang had already completed the second problem-solving process, but the space left for him was only half of a blackboard.

How to do?

How should the third approach be presented?

For a time,

Xu Mang stood there stupidly, not knowing what to do.

At this time, Xu Mang was in high spirits, and finally felt a youthful feeling, but this feeling was too short, not even half an hour.

"This classmate!"

"You are very good!" Professor Xie showed a satisfied smile, and said to Xu Mang, "You are far beyond my expectations. It is not easy to master these two methods at the same time... and it is not procrastinated. The whole process There is no trace of excess, not bad, not bad, not bad!"

Xu Mang shrank his neck, and said cautiously: "There is a third way of solving the problem...but I can't write it down."

......

781章 是他是他就是他！（3/3，月票加更36/85）

Xu Mang's voice was very soft, but Professor Xie heard it clearly. He just said that there was a third solution to his problem, which made Professor Xie unacceptable. There was indeed a third solution, but absolutely It's not something he can grasp.

"This classmate?"

"Are you sure there is a third solution?" Professor Xie asked seriously: "Don't do things beyond your ability, in fact, the two solutions have already satisfied me very much, so let's just forget it. "

Forget it?

Xu Mang would never agree to such a situation of forgetting it, how could it be forgotten?It's already at this point, but in the end, just forget it and let it go, how can this roaring youth be released?

"Cough cough!"

"The third solution still uses the translational reference system of the scattering particles, which is different from the first solution. It does not use the kinematic equation formula under the action of the inverse square law force, but uses the equation satisfied by Rmin and the specific formula." Xu Mang said calmly, "The equation URminE that Rmin satisfies."

"..."

moment,

Professor Xie didn't want to talk anymore. This is not a student at all, nor is it a research institute. This guy has already graduated with a Ph.D. and is engaged in research in the field of physics. Otherwise, it is impossible to know so much, and he uses it very skillfully.

If it is said that after thinking about the problem for a long time and getting three solutions, it is reasonable. It may be to find an expert to find the answer. However... the actual situation is that this guy did not think at all. Wake up and talk straight to the problem.

"Aren't you a student?" Professor Xie frowned and asked curiously, "It's almost impossible for a freshman to have such an ability. I've never heard of it..."

Xu Mang smiled, and said seriously: "Professor... I'm not a student, I was forced into class by you, since I'm here... why don't I write out the third solution, let me Let's take a look."

"it is good!"

"Don't leave after class is over!" Professor Xie said.

cut!

Why can't you go?