Xueba, I beg you to go and escort him quickly!

"Teacher Ge! The question that student Xu Heng posed is as good as yours, right?"

"That's right! Teacher Ge! Xu Heng's question is not easy! It's similar to the last question of the college entrance examination you gave before, right?"

Teacher Ge immediately shook his head, a little annoyed, "What's the same? It's much worse!"

· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·??????????????

Teachers, "???"

"The questions I asked were far from those given by Xu Heng!"

"This question not only examines basic knowledge such as the definition of arithmetic difference and geometric sequence, general term formulas, and properties."

"At the same time, it also examines the ability of algebraic reasoning, transformation and reduction, and comprehensive use of mathematical knowledge to explore and solve problems!"

"This question... well done! Well done!"

"Heroes don't mention being brave in the past! The problem that can be solved now is the problem!"

"That's a good question!"

"I think it can be used in the final question of the entrance exam!"

"Everyone! What do you think?"

Everyone, look at me, and I look at you.

"If this is put up, wouldn't it be difficult to die!"

"I'm afraid this isn't the most difficult mathematics exam paper in history!"

In the end, all eyes fell on Xu Heng.

"Student Xu Heng, please give me the answer as well!"

"We think that you have already prepared after the last paper-out group meeting!"

"Stop hiding it, write it all down!"

Xu Heng smiled slightly, but did not explain to the group of people that this question was improvised by him.

But it doesn't matter, just write and write.

Xu Heng picked up his pen.

Solution: (1) According to the condition: an=...

……

Therefore, the value range of d is [7/5,5/2]

(2) It is known from the condition: an=...

……

①当2≤n≤m时，[(q（n次方）-2)/n]-[（q(n-1次方)-2）/(n-1)]=[n(q(n次方)-q（n-1次方）-q（n次方）+2)]/[n（n-1）]

 …

when……

...is monotonically increasing, so...

……

②Set f(x)=2(x power)(1-x), when x>0,...

……

Therefore, the value range of d is [(b1(q(m power)-2))/m, (b1q(m power))/m]

After finishing writing, Xu Heng put down the chalk.

"Crash..."

There was thunderous applause.

Even Teacher Ge joined in the worship of Xu Heng.

Xu Heng, "%￥#@￥￥%%..."

No!

Hurry up and leave the math group!

If he stays like this, sooner or later he will reveal his secrets.

After finishing writing, Xu Heng didn't give these teachers a chance to react, and ran to another group.

Rao has a kind of carefree feeling of running after pretending to be thirteen!

In this way, it was noon.

Xu Heng had lunch with the newly appointed bureau chief of the province.

The director asked Xu Heng if Xu Heng had prepared those questions in advance, Xu Heng smiled, "Director, if I really prepared these questions in advance, I would come in with a small notebook."

The director froze for a moment.

What Xu Heng meant was very clear. My questions were not prepared in advance.

But the director didn't know whether he should believe it or not!

Believe?

Can Xu Heng really perform on the spot?

But don't believe...

Obviously Xu Heng's eyes are so serious.

Moreover!

On such an occasion, under such circumstances, there is no need for Xu Heng to pretend to be thirteen!

Xu Heng is a smart man!

Very fine!

The director decided that Xu Heng would not be so stupid as to pretend to be thirteen here!

"Uh...Xu Heng, so, so you mean..."

He chooses to believe it, but he still has to make sure.

While eating, Xu Heng said, "Director, I think you are honest, and I am honest too, so I will tell you the truth. Do you believe that... a temporary play?"

As soon as this word comes out!

The director's complexion suddenly changed.

Xu Heng, "???"

The director pointed behind Xu Heng.

Xu Heng turned his head, but it happened that Teacher Ge was behind him.

Xu Heng, "!!!"

Nima...

Turning around suddenly, looking at the director, the director immediately waved his hand, "It's not me! I didn't! I just noticed!"

Xu Heng's face turned dark.

Just talk to the chief!

But tell Teacher Ge, the nature is different!

Teacher Ge knows how difficult it is to come up with a question!

Don't look at how difficult and memorable his college entrance examination questions are.

But behind every question, it was passed after countless revisions and votes by show of hands.

But Xu Heng just played it temporarily, and he could make all the answers reasonable with a question at his fingertips?

Sometimes, the data for a question must be exactly the same, so that an accurate answer can be obtained.

Otherwise, only by constantly substituting, constantly trying, and repeatedly modifying can we succeed!

It is much more difficult to come up with a question than to do it...

Teacher Ge, "%￥#@￥#￥..."

PS: Kneel for all support!Thank you【伊人の恋】for your support!Four.

Chapter 312

Teacher Ge could hear clearly, and Xu Heng was no longer allowed to explain.

He sat down and fixed his eyes on Xu Heng.

Xu Heng, "Eh... Teacher Ge..."

Teacher Ge's eyebrows were twisted into twists.

He is well aware of the truth that "if you want to wear a crown, you must bear its weight", every question he asked was used in the examination papers, even the college entrance examination papers, he racked his brains and spent countless days and nights to solve the problem. In exchange.

Sometimes, even in his dreams, he was thinking about these topics.

But compared with Xu Heng, he felt that he was just an ordinary, mediocre person.

Never met before!

But now, he heard Xu Heng say that!

Only then did he realize that there are geniuses in the business of formulating questions!

And it's an absolute genius!

"I've been hearing how the teachers of the Mathematical Olympiad contest praised you, I still can't believe it, but now, seeing it with my own eyes, I have to believe it..."

"Student Xu Heng..."

"..."

The shock that Xu Heng brought to Teacher Ge lasted until the end of the paper.

But according to the original plan.

Xu Heng was going back to Yunshan High School. In the first examination room, good candidates took the exam together.

However, because of Huang Liangcai's incident, Xu Heng refused the examination issued by the academy.

This makes all the research institutes have deep resentment towards the Institute of Mathematics!

Especially in the Institute of Physics, the dean took people to the Institute of Mathematics for theory.

However, Xu Heng didn't take the exam for the past few days, so he went home.

Before leaving, Xu Heng signed a confidentiality agreement with the province.

Of course, this is also a form.

On the way the driver sent Xu Heng back, the phone rang.

It is the second uncle Xu Yuehai.

Xu Heng answered, "Second Uncle? Why did you call me?"

"What's the matter with Zong Yun...or...?"

Xu Yuehai was cheerful, "Thank you, Xu Heng! This time, he has improved by leaps and bounds! He is fine, mainly because I have something to ask for your help."

Xu Yuehai lowered his posture.

Xu Heng, "Uh...Second uncle, you can't ask for anything, what's the matter with you, tell me?"

Xu Yuehai, "Then I'll be blunt?"

Xu Heng, "Yeah."

Xu Yuehai, "It's like this. You don't give me advice during the Chinese New Year. Some friends inquired about it, saying that I have an expert friend or something. I have encountered some things recently and asked me to help."