The satisfaction of the school days seems to come relatively easily, whether it is something delicious to eat, or to make a problem, or to have a smile on the person you like, it is enough to make people feel happy.

Although Li Da has eaten a lot of better noodles, adding beef and pig's feet and the like, he still feels satisfied when he eats the bald noodles at school (our name for noodles without side dishes).

It's simple happiness.

However, if another pork knuckle noodles are placed in front of Li Da, Li Da will definitely choose pork knuckle noodles.

When he was returning to the classroom after eating noodles, he passed by the school shop, and Li Da paused for a moment and decided to go in and have a look.

This is not the first time Li Da has passed by, because the store is the only way back to the dormitory or to the canteen, but Li Da didn't have any money before, so it was naturally difficult to get in.

However, this time when he went in, Li Da didn't find anything he wanted to buy.

Most of the snacks in the store, Li Da doesn't like to eat snacks, like spicy strips, it's okay to eat them occasionally, and Li Da basically doesn't touch the rest.

But now Li Da is probably full, and he doesn't have anything to eat.

It's not good to buy anything, so Li Da took away two lollipops, which are really good, five cents each.

Putting it in her pocket, Li Da walked back to the classroom, Luo Dongqing had already woken up, she was looking at the revised part of the workbook that Li Da gave her, and saw that many questions were wrong, and Luo Dongqing was also very frustrated.

On the first day, she was still very nervous, but now she knows that mathematics is not something that can be understood by learning it casually, and the problems she made are the least difficult.

"Well, I'll give you a piece of candy. ”

Li Da took out the two lollipops, gave her the orange-flavored ones, and held the peach-flavored ones himself.

It takes a lot of effort to tear the packaging of this lollipop. Trying to break the package, Li Da shoved the lollipop into his mouth.

This taste, sweet tooth loss.

Luo Dongqing was still watching Li Da's solution process, and did not go to get the lollipop, Li Da explained: "You have to grasp a key point in doing this kind of question, which is to use known conditions to derive more conditions, and then use these conditions to derive more conditions." ”

This is the basic idea of mathematical proof problems, and when the conditions are insufficient, it is necessary to create conditions, and the auxiliary line is used to create conditions.

Li Da didn't tell Luo Dongqing that her solution to the problem was all about imagination, after all, Luo Dongqing was already very uncomfortable, and what she needed at this time was comfort, and ridicule was for those who didn't work hard even though they didn't have any results.

"One technique is reverse reasoning, for example, in this problem, you want to prove that one line is perpendicular to another line, you can think the other way around, how can you prove that two lines are perpendicular?"

Luo Dongqing fell into deep thought, and then, thirty seconds later, Luo Dongqing shook his head, and Li Da suddenly said helplessly: "A straight line perpendicular to the plane is perpendicular to any straight line in the plane, this theorem can be used, then next, you just need to prove that this line is perpendicular to this surface, right?"

"Uh-huh. ”

Luo Dongqing nodded again and again, with a suddenly enlightened look, and Li Da asked again: "How to prove that the line is perpendicular to the surface?"

"Prove that it is perpendicular to two intersecting straight lines in the plane. ”

Luo Dongqing said with a pure smile, it seems that at this moment, Luo Dongqing felt true happiness.

Li Da put down the pen and said, "You can prove the rest yourself." ”

"Uh-huh. ”

Luo Dongqing nodded, showed another smile to Li Da, and said, "Thank you." ”

"You're welcome. ”

Li Da was a little indifferent.

But some people are calm on the surface, but in fact, the wind is already surging inside......

Why is this guy so cute?

Could it be that I am a single tail control?

No, no, don't smile at me.

Why does she look so good when she smiles?

Men really like beautiful girls of eighteen years old.

These are Li Da's inner activities.

Li Da seems to be as stable as an old dog, but he is actually panicked.

"The old man is twenty-seven, and he thinks the sixteen-year-old girl is cute, so there's nothing wrong with it, right?"

But Li Da doesn't want to be a Lolitacon, but, the smile of the single ponytail plus Holly, this combination technique is really a little uncontrollable, you say you, usually have a cold face, why are you laughing today?

Let the old man's heart pound, in case there are any evil thoughts, it's not good!

Li Da suddenly felt that he had also become a drama spirit, there were so many inner dramas, people might just be happier today, and if he changed his hairstyle, he might have changed his mood.

In fact, he was said by Jiang Kai at the door yesterday.

At this time, Luo Dongqing also proved the question just now without looking at Li Da's answer, and as a celebration, she tore open the wrapping paper of the lollipop, stuffed the lollipop into her mouth and held it, this lollipop is so sweet.

Luo Dongqing took it out again, smacked her mouth, and then stuffed the lollipop in, and when she saw Li Da looking at her, she didn't think much about it, just asked, "Is your manuscript finished?"

Luo Dongqing took the initiative to ask for Li Da's manuscript, and in order to hide his weakness, Li Da hurriedly nodded, handed the manuscript to Luo Dongqing, and added: "Class is coming soon, don't watch the class, listen carefully." ”

"Got it, Uncle Da!"

Luo Dongqing's title made Li Da a little uncomfortable, and said, "Are you giving me a nickname?"

"That's right, whoever told you to always look old-fashioned, like an uncle. ”

Speaking of this, Luo Dongqing suddenly felt very happy, his nickname was too appropriate.

"I refuse this title, you call me my full name, it's really not good, you call me Lao Li Ducheng. ”

Li Da doesn't want to be an uncle, because the uncle happens to be the standard match with Lori.

"No, I just like this, Uncle Da......!

Because of Li Da's resistance, Luo Dongqing got up and stuck out his tongue at him, looking naughty.

Li Da: "......"

Are you a child, and slightly!

However, if Luo Dongqing wants to call him that, Li Da can't help it.

The first class was chemistry, Li Da's weak link, and after stopping the quarrel with Luo Dongqing, Li Da previewed the content he was about to learn in advance.

And Luo Dongqing got the manuscript, and when he saw that he hadn't gone to class yet, he took the manuscript and read it for a while, and when the class bell rang, Luo Dongqing happened to look at the itchy place.

Li Da reminded: "Go to class well!"

"Oh!"

Luo Dongqing agreed and put the manuscript aside, but listening to Yao Bing's lecture, she was bored, and she was thinking about the plot of the story in her heart, so she quietly took Li Da's manuscript and read it.

Li Da shook his head, alas, it's not so easy to make the scumbag fall in love with learning.

However, let her be, Li Da didn't say anything.

Since they are all sitting in the special seat of scumbags, it is normal to not study hard.

Although Li Da was also listening to the class, unconsciously, his attention also drifted to Luo Dongqing......