After eating, Su Yi went back to her room, took a shower, and continued to write her test papers boringly.

And Moss was very happy to enter the body of the big bear, sitting on the bed with a tablet and continuing to watch his bloody TV series.

Suddenly, there was a knock on Su Yi's room door.

Moss, who was watching TV, quickly lifted his bear head and looked towards the door.

Hearing the knock on the door, Su Yi also stopped his pen, turned around and took a look, then got up from the chair and walked to the door, opening the door.

After the door opened, it was Bai Yichen who came into view.

"I'm here to bring you milk."

Seeing that the door opened and Su Yi appeared in front of him, Bai Yichen raised his left hand and gestured to the milk in his hand.

Su Yi reached out and took the milk cup and thanked him, "Thank you, brother." ”

Bai Yichen smiled, "You're welcome." ”

The milk was also delivered, but Bai Yichen showed no signs of wanting to leave.

Su Yi looked at him, then took a step to the side and said, "If it's okay, brother, come in and sit back, and when I finish drinking it, please help me take it down." ”

With Su Yi's step, Bai Yichen had no reason, and immediately agreed: "Okay, then I'll wait for you to finish drinking and help you take it down." ”

Then, Bai Yichen followed Su Yi into her room.

As soon as he entered the room, Bai Yichen saw a very strange scene.

A toy bear sits on a bed with a tablet in its arms.

In fact, it is not a big deal for the teddy bear to be placed on the bed, and it is not a very surprising thing, but what makes people feel strange is that the TV is still playing on the tablet.

Bai Yichen could clearly hear the sound of the TV series coming from the tablet.

However, Bai Yichen didn't think much about it, but asked Su Yi very casually: "Xiao Yi, were you watching TV just now?" ”

No matter how Ren Bai Yichen thought about it, he would never have thought that the TV series would be watched by a bear, so he could only guess from Su Yi.

Su Yi glanced at Moss, who was pretending to be a bear and watching the TV series motionlessly, and nodded, "Well, I was watching it just now." ”

After speaking, Su Yi pointed to the sofa chair in the room and motioned for Bai Yichen to sit down, while she herself sat down at the desk.

Bai Yichen sat on the sofa chair and saw the test papers on Su Yi's desk, so he got up from his position and walked over and glanced at the papers written by Su Yi a few times.

Su Yi was writing the last big question of physics just now, and Bai Yichen knocked on the door after only half of it, so this question was not finished.

And what Bai Yichen is looking at is precisely this question.

Bai Yichen knew this question, because he was also making this paper today.

The last question is a comprehensive question, which involves a lot of knowledge points, and he also wasted a long time to do the last question, and he also asked the teacher for help if he made a mistake in the middle.

The most important thing is that his problem-solving process is many and complex.

Although Su Yi only wrote half of the question, his thinking was clear, and he didn't feel any detours.

The most important thing is that she made this first question in a few small steps, concise and clear.

Bai Yichen couldn't help but take a few more looks, and then suddenly realized as if he had found something.

This can be solved according to the conservation of momentum in the horizontal direction and the kinetic energy theorem.

It is so convenient to combine the two formulas and solve them.