Chapter 123: Precision

Liu Zhiyuan concentrated on writing and drawing on the manuscript paper, and immediately had two different ideas for solving the problem.
Looking around the gap, he looked around the classroom. Everyone is immersed in the topic, or rushing to write a book, or thinking deeply, the junior high school students in front of them look at them with curious eyes.
Liu Zhiyuan did not know how long it took the little girl in front of the podium to make this question, but he decided not to wait any longer. In order to grab the time, he raised his hand in advance.
The teacher squinted: "What is this classmate doing?"
Liu Zhiyuan stood up: "I have already got the answer."
Many people put down their pens and the whole class looked at him from time to time.
"This classmate is very energetic and talks about the process?"
Liu Zhiyuan has a cold sweat in the moment. In fact, he does not really improve the problem-solving process.

How long did Lin spend the time to get the answer?
he asked calmly.
"More than 3 points?"
Liu Zhiyuan’s brain began to run wildly. He had to get the answer right away. The easiest way was to enumerate. He held his breath for a moment, then his eyes lit up and said,
4.

There was a quiet moment in the class, and then there was a small commotion in the junior high school students.
Liu Zhiyuan looked nervously at the teacher and wanted to know right or wrong, but there was no expression on his face, and his heart sank.
"You come to the blackboard, write the process." Explain so.
Liu Zhiyuan walked very rigidly to the front of the blackboard. When he was close, he could see the chalk mark on the blackboard that had just been erased. There was a formula written on the blackboard, which was very close to his first idea. mold.
Liu Zhiyuan’s heart has been put down.
He couldn't help but look back at the little girl behind him.
It was only his subconscious movement, but when he looked at it, Lin retired half a step, and the black eyes flashed lightly, but deliberately avoided his sight.
Liu Zhiyuan has a feeling of being despised, but in the current situation, he can only turn his head to look at the blackboard, pinch the chalk, and change the second way, set the unknown number, the column equation, the model, and the solution...
On the blackboard, the formula is written line by line, and the answer process is gradually complete.
The more you write, the more you feel about Liu Zhiyuan. He is facing everyone, but the voice in the classroom is getting bigger and bigger.
He sweats at the tip of his nose and even his hands are shaking. He knows that he is wrong.
After writing the last answer, he put down the chalk heavily.
"The process is still very good." Wan teacher of their high school department praised.
"The idea is very clear." The teacher also said.
Liu Zhiyuan rubbed his hand on the tip of his nose: "It’s hard to say, I am wrong, the answer should be 2."
When he said that he would step down, he was stopped.
"Does Liu want to analyze why you are wrong?"
Liu Zhiyuan was somewhat angry. It was like a naked humiliation, but he still answered the question: "I am too fast, and I have not lost my brother's money."
"Why didn't you subtract your brother's money?"
"Because... because..." Liu Zhiyuan was hard to answer why he didn't, but he did miss something in the process of thinking.
"What is your gain from this mistake?"
"This is just a fun math problem. "The focus of this interesting question is on the modulo operation..." He said that he suddenly felt a little problem. Why did their team like this start with a fun question?
Sure enough, the solution teacher asked: "Is Lin Xixi thinking?"
The little girl looked at the expression "You don't play" and said, "You just said that... the focus is on mathematical thinking, the language of mathematics..."
"Oh, this has been discovered by you." The teacher is joking.
At this point, Liu Zhiyuan suddenly felt that he was being played.
Teacher Wan is also a little angry: "What does it mean to solve the teacher?"

The meaning is very simple. For everyone, this question is not difficult, but it is an easy mistake. Under pressure, you will abandon the precise mathematical language and be forced to think in a more clever way. For example, I can't start with 5 dollars for each sheep... In mathematics, inaccuracies can easily lead to errors."
"You mean, I will answer 4 before because I don't have a formula?"
"It's not just a formula, but a way of thinking here." Solve a little bit of eyebrows and continue. "The next question is this: two students in the school solved the math problem on the blackboard. Please judge this statement. Question?"
"There are problems, more than two students in the school, we also answered it!"
"There are others!"
It is also the turn of the four-person group of Yongchuan Middle School sitting in the front row.
The class was a little more lively, and the high school students sitting behind were also liberated from the initial tension.
"Everyone can think about this answer." Explicitly look at Liu Zhiyuan first. "Is it interested to answer first?"
Liu Zhiyuan replied very seriously: "This sentence is ambiguous. Students from two schools can understand me and... she..." Liu Zhiyuan looked at the forest and continued, "a. We are from two different schools. The student solved the problem on the blackboard; b. We are two students at the school, and we solved the problem on the blackboard."
"What about you?" The solution was undecided, and asked Lin Xixi.
"If you ask me this question, I think that in this situation, this sentence is not much problem; but if it is not in this situation, it is almost the same as Liu's answer."
"Look, this will cause a problem."
And Liu Zhiyuan imagined that the teacher had to evaluate the answer to the wrong situation. Solve the chalk and write the question I just asked on the blackboard, and then seriously said, "Because we have situational support in the dialogue and thinking of the actual spoken language, for the sake of simplicity, some things will be omitted, but sometimes It also affects our written language and thinking process becomes less precise."
When I heard the word "precision", Lin looked up at the solution.
She seems to be too familiar with this content. She always feels that the syllabus of this training team may still come from the hands of Lao Lin.
And when I was in elementary school, the situation of the exam was completely different. This time, the joint training of junior high school and high school was more vigorous and popular, and I came to class once.
"Just like the process of solving problems quickly, and this sentence..." Knocked on the blackboard and said, "You can hear this sentence now, and you don't think it has any problems. But if it prints On paper, it is ambiguous to read it by people who are not in the classroom. And mathematics... The accuracy of the mathematical language is very important, it not only ensures that you have a reliable infrastructure in mathematical calculations and related arguments; Ensure that the relevant content does not cause ambiguity in the dissemination."
Explain that here, Liu Zhiyuan noticed that Lin did not know when he had returned to his seat, and most of the students in the classroom began to listen carefully.
The classroom was silent, and he quickly rushed back to his seat.

Mathematicians have spent a long time almost equal to human history to build a relatively accurate symbolic language system, which we will learn below...

"Mathematics Symbol?"
"formula?"
"how to prove?"
The classmates sitting in the front row answered.
"No, it's language."

In the Sanwei University canteen, there are only a few windows open during the winter vacation.
Lin Chaoxi squatted at the dinner table, while licking the box lunch, while observing the slogan of the canteen, he recorded it with a pen, and in the vicinity of her, many of their training team students were doing similar things.
This is the homework of their
Chinese class
in this section, finding out the irregularities in the language of life and rewriting it in a more precise language.
Lin Zhaoxi wrote two short sentences on the book.
Suddenly someone was holding a plate and sat down beside her.
"Red braised beef?" Explained and looked at what was written on her book.
Lin Chaoxi quickly covered the answer.
In the magical book she borrowed from the library, someone discussed the "canteen ambiguity" in the corner. She just saw the name of the dish just now, and she wrote it down subconsciously, and tasted it. I really felt... a little fragrant...
Lin Zhaoxi: "Most of the recipes are ambiguous. For example, "broiled beef can refer to both the act of braising beef and the dish."

"Don't you think it's a horn?" If the gaze of the solution is not enough to the corner of the cafeteria, although there are so many explanations, some people still don't understand why mathematics training needs to be "language".
Lu Zhihao: "We have done everything we have to do."
I saw it directly: "Fortunately, Master has always been like this."
Zhang Liang: "Oh."
Lin Chaoxi inserted the lion's head with chopsticks and turned to look at her. She said sincerely: "I envy you have such a father."
"You don't have to envy, you can't see when I'm tired."
Hearing the words, he couldn’t smile, but he didn’t continue his pre-class questions.
Lin Zhaoxi looked at his tacit smile, knowing that he also accepted the fact that Lao Lin would rather write a syllabus than to teach at Yongchuan University, and decided not to pursue it.
The author has something to say: I am slow to catch up, or missed a day, it seems to have lost wisdom, and every other day. 2k novel reading network