Double Life: My whole world is you

"Yeah, I'm a little curious." Cheng Qiao said, "She doesn't seem like such a weird person."

Luo Ting pulled her aside and said, "It's nothing. She just wrote me a note today saying that she wanted to compare her midterm exam scores with mine."

"Huh?" Cheng Qiao was even more puzzled, "Why?"

"Maybe I didn't score better than her in elementary school. I surpassed her in junior high school, so I must feel bad." Luo Ting sighed and said, "Alas, I was ignorant when I was young. I wrote her a letter of challenge and said I would surpass her. But she suddenly transferred to another school in the fifth grade."

After listening to her, Cheng Qiao nodded, "So that's how it is. You guys are so inspiring."

"I'm telling you, don't tell Wang Ran. She's a gossipy person, and I don't want to spread this." Luo Ting said, "No matter who wins or loses, we'll both be the ones who get hurt."

"She shouldn't be able to score higher than you in the exam." Cheng Qiao tried hard to recall that Luo Ting's grades had been very stable all the way to No. 1 Middle School.

"It's hard to say. She had a pretty good foundation in elementary school." Luo Ting shrugged. "I don't care about grades now. The main thing is to master the knowledge thoroughly."

"Yes, this is the thinking of a top student." Cheng Qiao nodded and said with a smile.

"Don't tease me, you are the same." Luo Ting replied, "You promised to keep it a secret for me."

"Okay, does this count as our common secret?" Cheng Qiao said with a smile, "I have a secret with the top student. Do I have to become his best friend?"

"We will become good friends." Luo Ting said as the bell rang and the two walked into the classroom arm in arm.

In my memory, I had a good relationship with Luo Ting. Later, she went to No. 1 Middle School, and Cheng Qiao went to a technical secondary school. During the three years of high school, we met a few times at a few small gatherings, but we lost contact when she went to college. This life is slowly changing, and some people and things are undergoing subtle changes. Cheng Qiao returned to her seat with a happy mood. At this time, her deskmate Liqin asked anxiously, "Have you finished your math workbook?"

"What?" Cheng Qiao said with a bitter face, "There is also math homework."

As soon as she finished speaking, the math teacher, Mr. Li, walked into the classroom. Cheng Qiao quickly sat down and picked up the math book. Although she did not feel sleepy during the two math classes, it was still very difficult. She understood every word the teacher said. She understood the exercises when the teacher was explaining them, but she did not know how to do them when she was doing them. She seemed to understand them, but she did not quite understand them. In this way, she spent the two classes in a daze.

After two math classes, it was lunch and self-study time. Cheng Qiao followed the group to get food first. Cheng Qiao ate the chili and leeks that her grandmother had fried that morning, as well as the pickled vegetables, with relish. Wang Liqin, who was standing next to her, looked at her again and again, and finally said, "Cheng Qiao, I don't think it's good for you to do this."

Hearing her words, Cheng Qiao was a little confused, "What's wrong?"

"About you copying homework." Wang Liqin said seriously.

"I..." Cheng Qiao felt a little embarrassed when he heard her words. He was planning to lend her his math workbook to copy after dinner, but now he couldn't bring himself to say it.

"Actually, if you don't know how to do it, you can ask me and I can teach you." Wang Liqin said again, "I am very happy to sit at the same table with you. I regard you as a competitor, not..."

Hearing her words, Cheng Qiao felt a little ashamed. She had been wasting her time for the past week and had not calmed down to work hard. No matter what the outcome was, she should still cherish the process of hard work. Cheng Qiao scooped a mouthful of rice into her mouth, then looked at Wang Liqin and nodded seriously. This was about to stand up, and talk about the importance of having a good deskmate.

Cheng Qiao quickly followed Wang Liqin to the classroom after finishing her meal and washing the dishes. She picked up the math workbook and started to do the simple triangle angle questions. These were relatively simple. Generally, the sum of the three angles was equal to 180 degrees. It was equivalent to addition and subtraction within 2, or multiples. AB+BC=AC, AC=AB and other relatively simple questions. These questions were easy to do. But wait, what are the questions behind? They are also triangles, why are they so complicated? Why draw so many triangles in a triangle? It's so difficult, I want to cry! Being a student is not easy. In addition to learning what the teacher teaches, you also have to do exercises. And the exercises are not the same as in the book. They always become all kinds of tricks.

Wang Liqin looked at her several times and saw that she was staring at a question in a daze. Thinking that she didn't know how to do it, she gently patted her shoulder and asked, "Don't you know how to do this question?"

"Yeah, it's very complicated." Cheng Qiao replied with a frown.

Wang Liqin glanced at the question and said, "This question is not bad."

"It's so difficult. I'm a little confused." Cheng Qiao looked at her and said.

"It's not difficult. Read the question once."

Cheng Qiao read, "As shown in the figure, in the equilateral triangle ABC, D is the midpoint of AC, point E is on the extension line of BC, and DE=DB, the perimeter of ABC is 9cm, then ∠E=? degrees, CE=?cm."

Cheng Qiao looked at Li Qin blankly after reading it. "∠E = how many degrees? CE = how many centimeters?"

"This is very simple. ∠E equals 30 degrees, and CE equals 1.5 centimeters."

"Why?" Cheng Qiao asked, "How did you calculate it?"

"The angles of the three sides of an equilateral triangle are equal, that is, 60 degrees, so ∠ABC is equal to 60 degrees. It is known that D is the midpoint of AC, so ∠ABD=∠DBC, so ∠ABD=∠DBC=30 degrees. It is also known that DE=DB, so ∠DBC=∠E=30 degrees." After she finished speaking, she looked at Cheng Qiao and said, "Isn't it?"

"It seems so." Cheng Qiao nodded vigorously.

"Then how many centimeters is CE equal to? That's easier to calculate, isn't it?"

"Why?" Cheng Qiao asked sincerely.

Wang Liqin continued mumbling, "The perimeter of an equilateral triangle is 9 centimeters. Do you know the perimeter of a triangle?"

"Is the perimeter of a triangle the sum of its three sides?" Cheng Qiao asked weakly, "Are the three sides of an equilateral triangle the same length?"

"Yes, isn't this knowledge known to fourth and fifth graders in elementary school?" Wang Liqin looked unconvinced, as if asking, don't you know?

"Sorry, sorry, there was a sudden short circuit." Cheng Qiao scratched his head. It has been nearly twenty years since I graduated from elementary school, and I have returned everything to the teacher.

"So, the CE at the back is equal to 1.5 cm, do you understand?" Wang Liqin asked.

Cheng Qiao shook his head honestly, "I don't quite understand, but from what you said, I looked at the picture and CE looks like half of AC, so it should be 1.5 centimeters."

"This is not what we should do. This is what we calculated." Wang Liqin pointed to the exercise and said, "Look, ∠DBC=30 degrees, ∠DCB=60 degrees, so ∠BDC=90 degrees, and we have already concluded that ∠DBC=∠E=30 degrees, so ∠BDE=120 degrees, ∠CDE=∠BDE-∠BDC=120 degrees-90 degrees=30 degrees, and ∠E is also equal to 30 degrees, so CE=DC, and D is the midpoint of AC, CE=CD=AD=1.5 cm. Do you understand?"

"I think you understand it completely now. Thank you." Cheng Qiao said sincerely.

"Huh, it's okay." Wang Li exhaled, "You should remember the knowledge points carefully. This kind of questions are still very simple. The ones later will be more difficult."

"Okay, okay, I will." Cheng Qiao promised, and quickly took out the math book to read. But when he read it, he really read it and remembered it, but sometimes the logic just couldn't be turned around...