"Ding!" The class bell rang.

Zhang Song and Jia Fanzhen ran into the classroom at the last moment, and Zhang Xiaoli looked at them: "You two are really amazing, you can run fast by yourself, you want to be a bell-stepping clan, right?" ”

Gu Xu leaned into Lan Ruosi's ear and whispered: "I saw them at the school gate twenty-five minutes ago, the two of them walked from the school gate to the classroom, five minutes away, and to exaggerate, ten minutes away, twenty-five minutes away." ”

"They are supposed to be turtles."

At this moment, the classroom was already full.

Zhang Song and Jia Fan looked at Zhang Xiaoli embarrassedly.

Zhang Song whispered, since they are all bell stepping clans, how can they be afraid of being late.

Zhang Xiaoli said again: "You two look at the report card, where to sit, hurry up and sit on the seat." ”

Zhang Song said, glancing around, there were two empty seats in the fourth row, the third and sixth columns.

Zhang Song and Jia Fanzhen looked at the report sheet.

Jia Fanzhen's name is in the front, and Zhang Song's name is in the back.

Two people have the same grades.

They looked at each other and were amazed.

Not only that, but the two of them did the same.

Zhang Song and Jia Fanzhen came to their seats reluctantly.

Zhang Song sat in the sixth column, and Jia Fanzhen sat in the third column.

Zhang Song was very unhappy in his heart, Jia Dazui, if you take the test a little higher, or lower in the front or back row of me, it's okay.

You're side by side with me!

There are two people in the middle, isn't this the same as scratching the boots!

Jia Fan is also very unhappy, Zhang Fatzi, why can't you take more tests, or take fewer tests.

"Everyone is here, now it's class!" Zhang Xiaoli said.

"This time, the total score and average score of our class in the monthly examination are the first, and many students have improved a lot. For example, Gu Xu, Zhang Song, Jia Fanzhen.

Gu Xu has improved by 30 places and has improved by leaps and bounds. Listening to Mr. Shen, I got a full score for my essay again. ”

Gu Xu's eyelids subconsciously raised, he really didn't expect it.

Lan Ruosi looked sideways at Gu Xu, she was happy for him from the bottom of her heart.

"What's more worth mentioning is that Zhang Song and Jia Fanzhen, their last math score was zero, this time, Zhang Song's math score was 120 points, and Jia Fanzhen's score was 110 points.

Although, the two of them scored zero points last time because of a special accident. However, Zhang Song's previous math scores have always hovered around 90 points, and Jia Fanzhen has never failed math.

This time the two have made so much progress, which is worthy of praise.

In addition, some students' grades have regressed slightly, but don't be discouraged, it's normal for grades to change. In fact, those classmates are not regressive, but some students have made great strides. I hope you will make great progress in the next monthly exam! ”

After Zhang Xiaoli finished saying this, the following students couldn't help muttering: I just finished the third monthly exam, and Mr. Zhang is anxious about the next time.

Zhang Xiaoli said without hearing: "Okay, let's take out the test papers, and we will start talking about the questions now." ”

Zhang Xiaoli looked at the following seriously, and everyone immediately closed their mouths.

"Speaking of lecture questions, one of the things I am very happy about in this monthly exam is that none of the first multiple-choice questions in our class got wrong, and only one person got the second and third multiple-choice questions wrong.

So, I won't talk about the first question. The second, the third, the wrong student to see if he is too careless, do it himself.

If you still can't do it, ask your classmates privately. ”

Gu Xu looked at the first multiple-choice question, thinking back to the beginning, when he and Lan Ruosi were at the same table for the first time.

Zhang Xiaoli said above that the first multiple-choice question is a scoring question, which is wrong and should not be.

As a result, he was wrong!

And it was wrong in front of the little daughter-in-law.

At that time, his test papers were all red, and now, his test papers are also full of red.

It's just that the difference is that before, he was full of red crosses, and now he is full of red ticks.

"Let's move on to the fourth question. In the fourth and fifth questions, only three people did it wrong, and I won't talk about it, you communicate privately. ”

The more Zhang Xiaoli spoke, the more proud she became, "Look, your grades are good, and I can stop talking about some questions." This seems to be a time-saver for me, but it's actually a time-saver for yours.

Let's look at the sixth problem, which is a derivative problem. ”

Lan Ruosi looked at the question explained by Zhang Xiaoli, this topic was a piece of cake for her, and she could see at a glance that the answer was 2X.

Zhang Xiaoli said: "There are many students who get this question wrong, let's take a look at the question."

The polynomial f(x) satisfies for any integer x

f(x)=x+x+......+x, where there are x x's on the right side of the equation.

For the real number x, find the derivative of f(x).

The derivative of x is 1, and many students misunderstand that the derivative of f(x)=x+x+......+x is the addition of X 1s.

f'(x)=1+1+......+1, where there are x 1s on the right side of the equation

So many students choose, f'(x)=x, which is not right! ”

As soon as these words came out, everyone discussed, "I think so too." ”

Gu Xu looked at his test paper, he also made a mistake in this question, and his thinking was really what Zhang Xiaoli said.

Zhang Xiaoli continued: "Everyone, pay attention, f'(x)=(x+x+......+x)'=(x²)'"

As soon as Zhang Xiaoli finished speaking, someone below said, "Teacher, we will." ”

Everyone chimed in: "Teacher, we will." ”

"Will? So what is the answer. ”

The crowd shouted in unison: "2X." ”

"Look, you just weren't careful when you did the question, pay attention next time, the same mistake, don't make it a second time.

There may still be students who are puzzled, let me emphasize again, X 1 adds up to X, can this be understood? Then X X wants to add, you propose an X, isn't it X 1 that you want to add in parentheses......"

"Understood, teacher, let's talk about the next question."

Seeing this, Zhang Xiaoli estimated that most of her classmates would, and she continued to talk about the next question.

Zhang Xiaoli took advantage of the morning self-study time and talked about all the multiple-choice questions in one go.

She felt in a good mood.

In the middle of her lecture, the students said that they would be able to talk about the next question.

This kind of lecture is very relaxed, the teacher is not tired, and the students are not tired.

Zhang Xiaoli looked at her watch, there were still a few minutes before the end of class.

"By the way, I emphasize one thing. Physical education students who have taken the physical education exam are going to train. If you want to take the physical education exam, you can register your name with the sports committee, and after school in the afternoon, you will train directly in the playground and have a physical education teacher to guide you. ”

As soon as she finished speaking, the bell rang for the end of class.

As soon as the class ended, Gu Xu stood up and looked at Zhang Song's position.

He dragged Lan Ruosi: "Look, Zhang Song and Jia Dazui are sitting in the same row." ”

Lan Ruosi looked at it: "The two of them are really interesting, but it's okay this way, they don't have to quarrel." ”

"You think they'll be happy if they don't fight? It is estimated that if they don't quarrel, they will be uncomfortable. ”

As the two spoke, Zhang Song and Jia Fanzhen had already walked up.

The four of them walked out of the classroom and went to breakfast.

Gu Xu asked Lan Ruosi, "What do you want to eat?" ”

Lan Ruo thought for a while: "I want to eat rice noodles, mainly because I want to drink their soup." ”

Gu Xu nodded, and looked at Zhang Song and Jia Fanzhen again: "What do you two want to eat?" ”

Zhang Song and Jia Fanzhen are discussing the issue of seats.

Zhang Song said: "You say, the scores of the four people are the same, why don't our names be together?" ”

Jia Fanzhen replied: "Yes! I'm weird too. ”