Kuaishou's heartthrob host, he just wants to make a career

After the mid-term exam, they face re-classification.

Both Jiang Hang and Lin Yan successfully entered the rocket class. There are a total of forty students in the rocket class, all of whom are in the top forty of their grade. They are the top class of the entire grade. The competition is quite fierce.

But this time at the end of Class F, two people were promoted suddenly, and one of them was Su Yanxi, who was only one point behind Jiang Yue, the first grader, and the other was Jiang Hang, who came from a family of mathematics.

So as soon as the two arrived in class F, the other students felt the pressure instantly.

The atmosphere of the Rocket class is completely different from that of Class F. The learning atmosphere in the class is more intense. Every student seems to only study in their hearts, which makes people feel depressed.

Liu Qin, everyone also calls him Director Liu, not because he is the head teacher of the rocket class, but because he is a member of the Qingda Mathematics Association and the grade teacher.

Oh, by the way, he is still Liu Gu's father.

"You are Su Yanxi?" Liu Qin looked at Su Yanxi, and everything was pleasing to the eye.

When Zhou Mian said that he met a young math genius on the bus, he still didn’t believe it, thinking that Zhou Mian had admitted the wrong person, but the exam gave him a big surprise, and he finally understood why Zhou Mian was so excited that day.

Lin Yan nodded: "Director Liu..."

Liu Qin patted him on the shoulder in satisfaction, "Go, your seat is over there."

Lin Yan thought that he could continue to be at the same table with Jiang Hang in the new class, but the seats in the class are arranged according to the ranking.

By such a coincidence, Lin Yan and Jiang Yue sat at the same table, and Jiang Hang sat behind him.

Jiang Yue said proudly: "Jiang Yue, we met before."

Also eat together.

Of course Lin Yan remembered her, "Su Yanxi..."

The other party nodded slightly to show that he understood, but most of the time, he still exuded the aura of "Don't get close to strangers, don't disturb me".He is not good at talking to girls, Jiang Yue ignored him, and he was too embarrassed to try to get close to them with a face.

Because Lin Yan did very well in the science and comprehensive exam this time, he was also a dark horse who jumped up from F after transferring to another school. The next few classes were the object of the teacher's special attention.

Some teachers don't know him, and they will specifically call out his name.

The teacher Zhang who invigilated him last time was the chemistry teacher of the rocket class.

Students in the Rocket class don't like gossip like Class F. This class is under a lot of competition pressure, and if you don't pay attention, you will be dismissed. Few students go out for entertainment when get out of class is over, and almost all of them are studying.

Lin Yan thought that he and Jiang Hang had worked hard enough when they were in class F, but compared to them, they were nothing, even Jiang Yue.

There are only a few true geniuses, and it takes a hundredfold effort for others to catch up with those geniuses.

When school was over in the afternoon, Liu Qin specially came to the classroom early to let Lin Yan and Jiang Hang stay.

Jiang Hang seemed to know something, Lin Yan was a little confused.

Before Jiang Yue packed her schoolbag and left, she finally said the second sentence of the day to Lin Yan: "Treasure it, this is Lao Liu's test for you."

Lin Yan didn't understand at first, but soon he understood what it meant.

In addition to Jiang Hang and Lin Yan, there were several other students in the classroom, some from other classes, and some who were promoted to the rocket class from other classes.

Liu Qin came in with several math test papers.

Let them finish it within the specified time, and they can also hand in the papers in advance.

Lin Yan vaguely guessed something when he saw the question.

These questions are different from what they learn in ordinary classes, and the types of questions are wider and more profound.

The papers were handed out to everyone, Liu Qin: "Time one hour, let's start."

The classroom was very quiet, and soon there was only the rustling of the pen nib writing on the paper.

With the increase in knowledge reserves in the past two days, Lin Yan can easily handle the previous fill-in-the-blank and multiple-choice questions.

The whole set of test papers had fewer questions than usual exams, but the full score was very high, two hundred.But there are only two major questions in the back, each of which is fifty points, each occupying a page.

The first big problem is positive real numbers.

Positive real numbers x, y, z satisfy xyz≥1, prove that x5+y2+z5 of X2-x2...≥0;

He finally understood why Jiang Yue told him that this was Director Liu's test for them before he left.

Director Liu led a mathematics competition team, and every year he took students to participate in the mathematics competitions held in the whole city and province, and won the first prize, second prize and third prize in the province. In addition to receiving honorary certificates and bonuses, they also won Have the opportunity to be recommended to various key universities.

For example, Jiang Hang, when he was in junior high school, won the first prize in the junior high school mathematics competition, but he did not take the high school entrance examination, but was recommended to Golden Harvest.

These questions are the basic question types of high school mathematics competitions.

With this knowledge, he reviewed the numbers and symbols on the scroll before writing without hesitation.

证明：原不等式可变形为，x2-y5分之x5+y2+z2+y2-y5……≤0；

即x2+y2+z2分之x5+y2+z2……≤3；

From Cauchy's inequality and xyz≥1, we can get...

上面三式相加后并利用x2+y2+z2≥xy+yz+zx得到后的不等式证明，大于等于2+xy+yz+zx分之x2+y2+z2小于等于3。

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