Chapter 157 This is the difference between genius and ordinary
Although Zhao Long stopped talking, his expression could show that he was very unconvinced at this time.
Li Yan glanced at everyone and said, "I see that some of you are very unconvinced by my words. Okay, then let's demonstrate genius and ordinaryness on the spot."
"I'm going to ask a question now. You can all do the math and see how long it takes you to figure out the correct answer."
It is known that the function F(X)=asin+cos, and F(/π)=/√-1
(Find) the value of A and the maximum value of F(X); () ask in what interval F(X) is a decreasing function.
Li Yan wrote this question on the blackboard, then looked at everyone and said, "You can calculate it now and see how much time it takes you."
As soon as Li Yan finished speaking, many people picked up their pens and started calculating, with serious expressions on their faces and their brains running rapidly.
Five minutes later, someone finally raised his hand and gave the correct answer. At this time, Li Yan walked up to Ye Xuan and tapped the table with his fingers.
"Ye Xuan, wake up." Li Yan said, looking at Ye Xuan.
Ye Xuan's fingers trembled for a moment, then he raised his head and opened his eyes in a daze.
"Teacher, what can I do for you?" Ye Xuan said with a yawn.
"Ye Xuan, please calculate the question on the blackboard." Li Yan said to Ye Xuan.
Ye Xuan glanced at the blackboard.
"Ding! The host browses the math questions, and the math ability +1..."
"Ding! Intermediate mathematics ability is triggered, and the question is being analyzed...the question analysis is completed, and the answer is being delivered..."
Ye Xuan picked up the pen beside him and quickly wrote the answer on the paper.
It is known that f()=asin+cos and f(π/)=(√-1)/
(√-1)/=asin(π/)+cos(π/)
√-1/=a*√/-1/
a=
y=f()=sin+cos
y-sin=cos=√[1-(sin)^]
y^+4(sin)^-4y*sin=1-(sin)^
5(sin)^-4y*sin+y^-1=0
The discriminant △≥0 of the unknown number of the above equation is (sin), that is
(4y)^-4*5*(y^-1)≥0
y^≤5
-√5≤y≤√5
Answer: a=, f() maximum value=√5
"Teacher, I have already written the answer. Please take a look." Ye Xuan handed the written answer to Li Yan.
Li Yan picked up the answer and looked at it, with a satisfied smile on his face, turned around and walked towards the podium.
"Other students had correct and incorrect answers, but it took five minutes at the fastest to answer them. However, Ye Xuan took less than one minute from reading the question to writing the answer. This is the difference between ordinary people and geniuses."
"Is there anything else you're not convinced about?" Li Yan said, looking at everyone.
How can anyone dare to say anything at this time? In their opinion, Ye Xuan is simply incredible. It doesn't take even a minute from reading the question to coming up with the answer. No wonder Li Yan attaches so much importance to Ye Xuan.
Zhao Long looked a little embarrassed and finally had no choice but to sit down.
"Okay, since you guys are silent, let's continue the class." After Li Yan finished speaking, he picked up the math textbook and continued to explain the knowledge just now.
As for Ye Xuan, of course he continued to sleep on the table. There was nothing he could do, he was too sleepy.
"Ring, ring, ring..." As the bell rang, Li Yan stopped. After saying a few words, he left the classroom.
"Ye Xuan, you are so amazing, my God." Zhao Qiang ran to Ye Xuan's position with excitement and said.
"Yes, Ye Xuan, no wonder the head teacher values you so much. Nothing will happen to you even if you sleep in class. This genius is a genius. It is really a field that ordinary people can't touch." Wang Fugui sighed with emotion.
"Of course, Ye Xuan is ranked first in the mathematics competition no matter what. This is a symbol of strength. Some people can't understand their position and want to embarrass Ye Xuan. It's really ridiculous." Chen Li said with a smile.
"Axuan, how are you? Are you feeling better?" Liu Yiyi asked with concern on her face.
Ye Xuan rubbed his eyes, and then said: "I'm fine, I just went to bed too late last night, so I didn't get a good rest."
"By the way, how did you do with the questions I gave you?"
"Ye Xuan, this is my homework, can you see if there are any mistakes?" Zhao Qiang said with a smile, and then put his homework in front of Ye Xuan.
"Ye Xuan, this is mine, and I've finished it." Wang Fugui also took out his homework.
The other three people also handed over their homework to Ye Xuan. Ye Xuan took a moment to check it carefully. He had to say that the situation was much better than he imagined.
"Needless to say Yiyi, she has no problem. On the contrary, the four of you have made great progress. If this trend continues, you will definitely get good results in the monthly exam." Ye Xuan gave him a lot of praise.
affim.
Zhao Qiang and others laughed very happily when they heard this. After all, they also wanted to get good grades and impress others.
"Ye Xuan, don't tell me. Since listening to your lecture, I have found that there are many things that I can understand at a glance. So when I did the questions last night, I found that my problem-solving ideas were clearer and faster than before.
It has also improved a lot.”
"Yes, yes, I also have this situation. I used to get dizzy when I read the questions. Now I like them very much when I see the questions. After reading the questions, I think about it carefully and I know what to do. This really surprises me.
.”
"Isn't that right, Ye Xuan, you are really amazing. Studying with you, I find that I have made great progress."
"..."
Several people gathered around Ye Xuan's position and began to discuss it one by one. At this moment, they were so impressed with Ye Xuan that they fell in admiration.
When the nearby students heard what Zhao Qiang and others were discussing, they became curious and gathered around them. After learning about the situation, they were really envious of Zhao Qiang and the others.
"Zhao Qiang, you are so lucky. It would be great if I could be with Ye Xuan."
"That's right. If I can get Ye Xuan's extra lessons, my grades will improve very quickly."
"No wonder the head teacher values Ye Xuan so much. If it were me, I would value him too."
Zhao Long saw that Ye Xuan had once again become the focus of everyone's discussion, and his face became terrifyingly gloomy.
"Damn Ye Xuan, what's going on with him? I've never seen him so powerful before. Could it be that he was all pretending before?" Sun Li said, rubbing the back of his head. He thought for a long time but couldn't figure it out.
"Who knows this, but Ye Xuan is indeed very good at studying at this time. I don't even want to admit it." Li Wei sighed.
"Yes, maybe as the head teacher said, Ye Xuan is a genius and cannot be touched by ordinary people."
Zhao Long became more and more angry as he listened.
What's going on? Why did these guys change their direction and praise Ye Xuan?
"What do you mean? Do you mean that I am not as good as Ye Xuan?" Zhao Long said coldly.
"Brother Long, how is this possible? In my heart, Brother Long is the most powerful. Ye Xuan is nothing." Sun Li said quickly.
"Yes, yes, Brother Long is the best. Ye Xuan can't compare with Brother Long at all."
[Author's digression]: 15 Refresh and you can read it (to be continued)