Lu Chen looked at Shen Xiyan with a smile, "Okay, let's expose it! Then you will not only take revenge, but you will also face Cao Jiuzhang's anger again......!" On the second page of your note, the formula in the third line was copied incorrectly! How can you even make a mistake in taking a note?

"How is it possible?" Shen Xiyan picked up the notebook and flipped to the place where Lu Chen said, "It's obviously less than the number! How could I make a mistake?"

"Just take a look at other people's things!" Lu Chen said lightly.

"Just look!" Shen Xiyan snorted unconvinced, and said to Chen Yan: "Yanzi, give me a note, I want to see if someone is telling me!"

"Give you ......" Chen Yan handed it over, secretly depressed in her heart, Shen Xiyan seemed to have quarreled with Lu Chen again, it was really terrible! My senior school flower, it doesn't matter if you hate Lu Chen, but don't delay me chasing him!

Shen Xiyan found the location that Lu Chen said and looked at it, and sure enough, it was a greater than number, and she was unconvinced, and asked for the notes of Xu Jie and Cheng Caixin in the second row, all of which were greater than numbers.

Lu Chen smiled, "Look, I said you remembered wrong, right? Teacher Cao said that this is a mandatory place for the exam, if it weren't for me, you would be tragic again......"

Shen Xiyan frowned slightly, "You don't listen well, why do you watch me take notes?"

Lu Chen sighed, "You don't take notes well in class, what do you always see me doing?"

"You ......" Shen Xiyan bit his lip, "Who is looking at you! I'm tired of looking at the blackboard, take a break from my eyes!"

"What a coincidence......" Lu Chen smiled, "I'm also tired from reading the blackboard, just look at your notes and take a break, is there a problem?"

"You're so boring! I'm too lazy to pay attention to you!" Shen Xi glanced at Lu Chen and lowered his head to read.

Lu Chen shrugged his shoulders and opened the textbook to read.

Chen Yanru on the other side was amnesty, the two of them finally finished arguing, and she was finally able to ask Lu Chen questions.

"Lu Chen, Lu Chen......" Chen Yan pulled Lu Chen's arm.

"What's the matter?"

Bell......

The class bell rang, and Cao Jiuzhang walked in with a serious face. Speaking of which, this old gentleman is really punctual, and every time he steps on the bell to enter the classroom.

Chen Yan's expression immediately fell, and she lamented in her heart, how could this be? Why did I go to class as soon as I had to talk to Lu Chen! My dear classmate Shen Xiyan, could you not quarrel with Lu Chen between classes in the future? Isn't this a waste of everyone's time?

Seeing Cao Jiuzhang's gaze sweeping over, Chen Yan hurriedly whispered to Lu Chen: "It's okay, let's go to class......"

Cao Jiuzhang only spoke for more than ten minutes in this class, and then turned on the multimedia machine, typed two questions on the slide lantern, and then sent down a stack of blank paper, "What I talked about in the last class and what I talked about today is exactly a small unit. The knowledge points required for these two questions do not exceed the scope of this small unit, so everyone should do it and hand it in before class. Books and notes are available for reference. Well, three blank sheets of paper per person, not enough to ask for more. ”

As soon as the words fell, the audience was in an uproar, and many people began to mumble.

"Huh? Exam ......"

"The legendary in-class exam!"

"Can you do that? I don't understand. ”

"I don't understand it either, so look for it in your notes......"

After sending the calculation paper, Cao Jiuzhang's tone of speech became much kinder, "You don't have to worry, there is time to do something, and the topic is not difficult to ......."

Listening to Cao Jiuzhang's words, many people have strange faces, about Cao Jiuzhang, about this Ximen blowing snow, there is also a legend, legend has it that he has a habit, that is, when the question is asked, he will always overestimate the actual level of the students.

Soon, the sound of flipping books sounded in the classroom, and Cao Jiuzhang slowly patrolled the aisle between the desks, and saw a journalism student flipping through the workbook, he couldn't help frowning, "Don't waste your efforts, there is no workbook in this topic, you should read the notes and textbooks." I have emphasized the knowledge points of these two questions! Students who take notes in class should know it. ”

Everyone's faces are a little strange, I took notes, why can't I find the slightest eyebrows? Teacher Cao, we don't read much, are you really embarrassed to lie to us like this?

However, Lu Chen felt that Cao Jiuzhang's words were very right, and when he lectured, he would casually add "This is the point" to those important knowledge. And these two questions are indeed examining those key points, and the investigation is not complicated, as long as you understand it a little bit, just make a small change, as for how it should change, Cao Jiuzhang also talked about it.

Lu Chen pondered for two or three minutes, and nodded secretly, what Old Man Cao said was really right, it didn't go beyond what he said, and it was really not too difficult!

Just when everyone was flipping through the books, Lu Chen had already begun to write. Although it was the first time to answer this kind of question, Lu Chen had also seen what the standard answers to those questions in the workbook were, so he wrote it in a decent manner.

As the first in the class to answer, Lu Chen naturally attracted Cao Jiuzhang's attention, and after a while, he walked next to Lu Chen and looked down, the corners of his mouth quickly picked, nodded with satisfaction, and said in a low voice: "You don't need to write the proof question in such detail, you don't need to write the clear proof from step three to step seven, just write the eighth step directly!"

"Oh......" Lu Chen nodded and began to simplify the derivation process.

Cao Jiuzhang nodded, his gaze turned to Chen Yan's scroll, and he couldn't help but sigh in his heart.

Chen Yan was not very good at mathematics, but when she was in class today, because of Lu Chen, she didn't know where her mind went, and she really didn't have any idea about Cao Jiuzhang's topic, and the paper was blank.

Seeing that Chen Yan was even in the wrong position to flip through the notes, and Lu Chen's second question was halfway written, Cao Jiuzhang could only shake his head secretly, people can't be compared!

As an old teacher who had taught for half his life, he knew that students like Chen Yan were really limited in ability, and it was useless to criticize, so he turned around and looked down at Shen Xiyan again.

Shen Xiyan's mathematics is much stronger than Chen Yan, although these two questions are difficult for her, but there is no problem in making them, when Cao Jiuzhang reads it, her first question has almost been completed.

However, she was depressed before class, and she was sitting next to Lu Chen, her mind was also a little impetuous, and her learning was a little unclear, so in the proof question, the part involving today's study was verbose, and she didn't know how many detours she had to make before she returned to the right path.

Cao Jiuzhang only looked at it for a while, and then his brows furrowed......