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At the end of the assembly, the students went back to their classes. book network . v o d t . c o m

The students of Class 15 rushed back to the classroom, and this afternoon it was another math task. Hurry up and be the first!

Cloud painting summarizes the knowledge points, and then releases tasks and exercises.

Pei Zixuan glanced at those things that were not very basic, threw them aside, and went to sleep.

But as soon as he lay down, someone immediately patted him: "Hey, second place, what does this question mean?" ”

Pei Zixuan twitched the corners of his mouth, glanced at the topic, and immediately frowned: "You pig, -x? and (-x)? It's one thing, why do people want that bracket, to eat and support? Pig brains! ”

Zhu Yiqun twitched the corner of his mouth, but in order not to be rectified by the first place, he could only nod stiffly: "Yes, yes, how do you know that my name is pig?" Ahem, can you make it clear to me? I look pretty much the same! ”

Pei Zixuan was speechless: "Suppose x is 2, -x?=-4;(-x)?is equal to 4......"

"It's different, but it's ......," Mr. Zhu said.

Pei Zixuan glanced at him coldly, "Can you wait for me to finish?" ”

"Yes, please!" Zhu Yiqun hurriedly lowered his head and made it small.

Pei Zixuan was going crazy, he didn't understand such a simple thing, but he still wrote patiently on the paper: "I assumed that X was a positive number just now, and now I assume that X is a negative number, such as x=-2." Then -x? is equal to -4; And (-x)? is equal to 4! See what's different? ”

Zhu Yiqun scratched his head: "It seems to understand ......"

Pei Zixuan directly threw down the pen.

But in less than a minute, he was poked awake again: "That...... 3rd power, 4th power, 5th power......"

Pei Zixuan vomited blood!

……

The afternoon is physics, and I just started learning physics in the second year of junior high school, so I don't need to review the first year of junior high school, just learn it from the beginning of the textbook!

Measuring this is relatively simple, pay attention to the unit of measurement and the error is OK. It is easy to confuse the reference in mechanical motion.

This understanding is easy for those who understand, and it is difficult for those who do not understand to turn around. However, the reference object must be learned, because the reference object of mechanical motion is so important that all physical calculations related to mechanical motion will basically need to be used in the future.

For example, the distance between cars traveling in the opposite direction and relative speed, etc., all need to be referenced. So this chapter must be understood!

After Han Fangzhou's explanation, he used specific examples to explain what a reference is......

After the first class of Yunhua, she explained to the class representatives that she was going to leave early.

Pei Zixuan immediately shouted: "I also have something, I have to go first!" ”

Fuck, he came to Class 15 to sleep, but he hasn't slept a minute since noon!

Yun Hua glanced at him: "Don't worry, the second period is a discussion class, you have to answer the questions of other students, this is the condition for you to come to class 15." After the second lesson, the task is complete and you can go. ”

Pei Zixuan: "......" Is it too late for him to leave Class 15 now?

Class 15 of this group of pigs, the question is so simple that it is deathly, he has to explain it several times, and explain it clearly little by little, otherwise he can't understand it at all!

You don't understand, you don't understand, he has been scolded so many times that he is a pig, but he is not angry, and he licks his face and continues to ask that simple question!

Annoyed to death!

Yun Hua patted Pei Zixuan's shoulder with a smile: "Come on!" ”

She has to go home quickly, and tell the editor that she has to go home early to deal with something after today's "Dream of the Qing Palace" is on the shelf!

Pei, who didn't run away, instantly drowned in the sea of questions of class 15 students~~~~

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