"Teacher, you won't be here to make up for us!" At this time, Liu Xu came in with a math textbook, and someone asked curiously.

Hearing this, everyone began to look at the math book in Liu Xu's hand.

"Why not?" At this time, Liu Xu looked at them funny, and couldn't help but ask with a smile.

"Is it reliable?" asked Hou Huangqishan at this time.

"You are stupid, if our teacher didn't have two hands, could the challenge he set have a mathematical solution?" said Hou Bin, another person who teased the brothers.

When everyone heard Hou Bin's words, they all felt that there was some truth, and besides, if they gave them a holiday for nothing, even if their teacher was stupid, he would not be stupid to this extent, not to mention that he was like a fox.

"Okay, are you reliable or not, don't you know next?" At this time, Liu Xu said to everyone with a smile, and everyone began to look forward to it when they heard Liu Xu's words.

Liu Xu looked at the people who were low, and smiled, and did not open the book, but directly picked up the chalk in his hand and explained it to them.

Liu Xu's speech is not fast or stiff, but analyzes each foundation for them in the most popular way, math rote memorization is not good to learn, as long as you can understand, then everything will become simple.

Therefore, the foundation is quite important, because many of his things need formulas to prove, but it is a simple formula, and many people who have poor understanding can't understand it, so he has to explain to them one by one what each number represents, and what each symbol represents.

At the same time, Liu Xu also found some simple questions and decomposed the formula into it for them to better understand.

"Jingle bell, jingle bell!" I remembered the bell for the end of class unconsciously.

"It's out so soon, and for the first time, I don't think math is too difficult?" someone shouted.

"Heroes see the same thing, am I a genius?" said someone at this time.

"Teacher Liu is really good, I can understand all this!" At this time, Lin Leng said to Huang Qishan and the others.

"Yes, yes! I was confused when I saw this formula, but now I can understand the question," Huang Qishan also said with a smile at this time.

"It's a tragedy!" Hou Bin shouted wailingly.

"So?" Hearing Hou Bin's shout, the people around him turned their heads to look at him.

"What kind of moth did you kid come up with?" asked Huang Qishan at this time.

"What do you think, Mr. Liu teaches so well, and if he doesn't prove that he is also quite good at mathematics, what about our challenge?" said Hou Bin at this time.

When everyone heard Hou Bin's words, they all couldn't help but roll their eyes, you can still think of this at this time, there is really no one else except you.

……

Liu Xu listened to the discussion of this group of ghosts, and couldn't help laughing there, and soon the bell rang again, and Liu Xu walked up to the podium again.

Liu Xu still explained to them in the same way, and at first it was okay, but as time went on, he found that the more people deserted.

Liu Xu knew that this might be because his brain was starting to get tired and resisted, so he stopped lecturing and instead let talented performers relieve their tired brains.

……

"Class 8 is making trouble again?" Hearing the singing from outside, there were people talking about Class 7 and Class 9 who were close to Class 8 and whispered.

"Who knows? Didn't you see that Teacher Liu was there? Everything is possible when Teacher Liu is here," someone whispered.

"Yes, yes! But to be honest, I envy Class 8, there is such a teacher who will not be boring and boring to study! You look at other people's days, you are looking at ours, I want to sleep when I see books now!"

"Agree with you, I suspect I'm tired of school now?" someone next to him whispered.

"What are you doing with these useless words? It's good to say that it's also someone's homeroom teacher, let's still read hard!"

"Don't talk, the headmaster is here!" suddenly someone shouted, and then the classroom was eerily quiet.

……

"Principal, we can't let Teacher Liu continue like this, we don't have a tradition of adding classes to our evening self-study," at this time, an old man and a middle-aged man walked over slowly, they had been watching for a long time.

"Director Lu, I think this is a good thing! You didn't see how enthusiastic the students in their class were just now," the old man said with a smile.

"Principal, that's not the most important thing, don't you see that he still lets those children sing during the evening self-study time? This not only affects their class, but also affects other classes," Director Lu then said persuasively.

When the principal heard this, he didn't say anything this time, he knew the character of the director in front of him, and knew that he didn't have any malicious intentions, but he was a little conformist.

Liu Xu's several practices obviously broke the original rules of the school, so the director had a different view.

However, the principal himself knows that singing during the evening self-study time is indeed a bit excessive, and it really affects other classes.

"Look at this question, ......," Liu Xu said as he continued to explain.

"Teacher, teacher!" Someone suddenly shouted, interrupting Liu Xu's speech, making Liu Xu frown for a while, but then looked in the direction of his finger, only to find that the principal seemed to be looking for something at the door.

"Is there anything wrong with the principal and director?" At this time, Liu Xu put down his textbook and walked out, looked at the two and asked.

"It's not too big, you said it very well, and the students are willing to listen," the principal said at this time, but Director Lu, who heard this, frowned, but the principal had already made up his mind, and he was not good at saying anything.

"Headmaster, your old man won't come here just to praise me!" Liu Xu said with a smile at this time.

"You, you, I'll just say it straight, it's okay to make up for self-study in the evening, but don't make too much fuss, after all, our school's soundproofing measures are not good," the old man said jokingly.

Hearing this, Liu Xu immediately understood what was going on, and Liu Xu, who wanted to understand it, couldn't help but spy on his own mistakes, but he didn't expect this.

"I know the principal, I apologize for my mistake this time!" At this time, Liu Xu looked at the old man and said, hearing Liu Xu's words, the principal couldn't help but nod with satisfaction.

"Headmaster, do you mean that as long as it doesn't affect the brother's class, isn't it okay to relax appropriately?"

"It doesn't affect others, that's ...... ," the old man replied halfway, and suddenly felt that there would be no place, so he stopped.

"What the hell are you kid trying to do again?" the old man asked at this time, looking at Liu Xu.

"I really didn't pay any attention, your old man can rest assured!" At this time, Liu Xu said comfortingly, hearing Liu Xu say this, the old man didn't feel that something was wrong there, so he could only nod and leave by default.

After seeing the old man leave, Liu Xu started his lecture again, and unconsciously used three classes to explain the key points of mathematics he had learned in the past two months to everyone.