In the blink of an eye, November came, and the first semester of Xia Lu's freshman year entered the midterm stage.

The students in the science class of Hony School are familiar with the grading mechanism of the four core courses of mathematics, physics and chemistry.

There must be a written exam at the end of the semester, and the score of this final exam is more than 50%.

The remaining fraction score varies from person to person, and each instructor has their own way.

The rule of Professor Yu Feng in mathematics class is that the score of the mathematics final exam is multiplied by 0.6 + the score of the usual homework multiplied by 0.4 = the total score of mathematics.

Professor Cao Zhenggang of the physics class set that the score of the final exam of physics is multiplied by 0.59 + usual performance multiplied by 0.41 = total score of physics.

Chemistry and biology teachers also have their own preferences.

In summary, the total semester score of mathematics, physics and chemistry students = A+B.

A is hard, just take the test once.

B is soft and flexible.

Professor Cao Zhenggang of the physics class set the standard of "usual performance multiplied by 0.41", which reflects the humanized care.

"Usual performance" is a general statement, it can be the grades of the usual homework, or the attendance rate, but also look at the appearance, but also look at the teacher's mood.

In today's physics class, Cao Zhenggang said: "Let me remind you again, if you miss a physics class without reason, your usual performance will be counted as 0 points." ”

"Good, good. The 25 students in Science Class 1 nodded their heads one after another.

No one dared to miss Professor Cao's physics class, because his usual performance accounted for 41% of the total semester score.

"Sang Qin was not feeling well, so she asked me for leave in advance, which was allowed. Cao Zhenggang said again.

There are 26 students in the first class of science, and Sang Qin is one of the few girls. As the weather gets colder, it is normal for someone to take leave when they are sick and will not be counted as absences.

"Don't say much, let's talk about the topic first. Cao Zhenggang turned around and wrote a question on the blackboard.

1/a(t)=1/a0+2iћ/m•t, where a0=a(0)

The students looked at the blackboard, some thoughtfully, some with shining, and some secretly complaining "what the hell".

"As I said in the last lesson, we can describe a particle in a particular case with a time-varying wave function that describes the successive changes in states that occur over time. Cao Zhenggang knocked on the blackboard and said, "For free particles, please prove the equation on the blackboard." You've all brought your notebooks, right? When you're done, tear it off and give it to me. Proof time, 15 minutes. You can consult any information you have brought. Alright, please start your proof. ”

The assessment of "usual performance" is everywhere, and it may pop up without you noticing.

With this kind of physics teacher, do you dare to skip his class?

This physics question is actually a quiz in class.

"Hey, Xia Lu, lend me a piece of paper. Zhang Kai poked Xia Lu's back, he sat in the seat behind Xia Lu, he brought a laptop, not a notebook.

Xia Lu tore three pieces of paper, turned around and handed them to Zhang Kai, and whispered: "One piece of paper is not enough, the proof process needs to write two sheets of paper, and there is one piece of paper for you to draft." ”

"Do you have an idea?" Zhang Kai was a little surprised, he asked, "From which angle should the proof of this equation be cut into?"

Cao Zhenggang on the podium was in control, and he reminded solemnly: "Zhang Kai, do your own questions and keep quiet." ”

Zhang Kai was immediately silent, he took the three pieces of paper handed by Xia Lu, and then fell into deep thought, how to prove this question?

Some students flipped through books, and some students went online to find answers.

However, they found that Professor Cao's question was made up, and there was no dry goods on the Internet.

At this time, Xia Lu left his seat, he took two pieces of paper full of physical symbols, and walked up to Cao Zhenggang: "Professor Cao, I have finished proving it, please confirm." ”

At this time, less than ten minutes had passed since Cao Zhenggang announced the "start of proof", and Xia Lu was the first person to hand in the class assignment.

Cao Zhenggang quickly reviewed the two pieces of paper that Xia Lu handed over.

Xia Lu uses the Schrödinger equation iћ∂ψ/∂t=-ћ^2/2m∂^2ψ/∂x^2 to ψ(x)=Ke^[a(t)x^2+c(t)], and obtains -iћ(da/dtx^2+dc/dt)=-ћ^2/2m(-2a+4a^2x^2). The above expression applies to all x, so the coefficient equation of the same power of x is the same on both sides, i.e., -i ћda/dt=-ћ^2/2m4a^2. In summary, 1/a(t)=1/a0+2iћ/m•t, the certificate is completed.

"The idea is correct, the proof is complete, but the handwriting is slightly scribbled, and the horizontal pull on the h is smelly and long, this problem, Xia Lu you have to correct it. Cao Zhenggang drew a standard five-pointed star on Xia Lu's homework paper.

The five-pointed star represents excellent, the triangle represents qualified, and the × represents spicy chicken. This is Cao Zhenggang's evaluation system.

"Okay, I'll make sure to correct it in the future. Xia Lu nodded and said, yes, yes, I have collected a five-pointed star from Professor Cao.

The 15-minute time for handing in homework was up, and the students all handed in their homework.

Who is excellent, who is qualified, and who is spicy chicken, only Professor Cao knows.

During the recess, Zhang Kaixian was a little depressed: "Professor Cao and Professor Yu are two different teaching styles, and Professor Yu gave us plenty of time to think and collect materials, so as to complete our homework in a safe and elegant way. And Lao Cao is like a guerrilla, one shot here and one shot there, it is difficult to figure out his routine. In this physics test, I may not get a pentagram. ”

If you can't get a five-pointed star, what's the difference between it and spicy chicken?

Xia Lu smiled, and comforted his roommate: "The problem assigned by Professor Cao is actually not difficult, and it can be easily proved with the Schrödinger equation. Zhang Kai, who is fine, will definitely not be limited to just one topic to measure whether a person is excellent. ”

"Damn, it's really Schrödinger's equation, it's over, I don't even think I can get a triangle this time, I'm just a spicy chicken." Zhang Kai is so irritable, he takes one less five-pointed star, and his roommate takes one more five-pointed star, which is the same as the other, accumulating over time, and at the end of the semester, the total score of the two may open up a certain gap.

Xia Lu worked hard in mathematics and physics, and chemistry and biology did not fall behind.

Chemistry and biology are experimental sciences, and in addition to imparting theoretical knowledge, teachers also pay attention to students' experimental operation ability.

In the laboratory building, Professor Xu, a biology teacher in a white coat, is instructing the students of Science Class 1 of Hongyi Academy to do experiments: "Students, today's experimental topic is serum protein acetate fiber film electrophoresis, and we will obtain the experimental results that are of biological interest through chemical methods. There are 26 students in your small class, in groups of two, divided into 13 groups. In this case, you are free to form a team first, and after you are divided into groups, I will teach you to do this experiment. ”

"Xia Lu, let's go in a group. Zhang Kai took the initiative to invite Xia Lu, who has been gaining momentum recently and has been praised by the teacher in all aspects. Of course, if you are looking for teammates, you have to find powerful ones, and the most afraid is pig teammates.