Chapter 65 Holding the grass, there is a person behind

After the exam rules were read out, the exam papers were quickly distributed to everyone.

The introduction of the test paper is divided into 3 questions.

The first question, let A and B be two points on the hyperbola x-y/2=z, the point N(1,2) is the midpoint of the line segment AB, and the perpendicular bisector of the line segment AB intersects the hyperbola at the two points C.D.

Please determine the value range of z.

"Damn it, is it so difficult?"

"Teacher, you want to kill us, don't you?"

"I don't know about coaching."

"..."

Just seeing the first question, the whole auditorium was full of wailing.

This question seems to be very short, but the knowledge used is very rich.

It covers almost all the knowledge points of the entire high school.

Even if the people sitting are at the level of academic masters, but when they get this question, they can't help but scratch their heads.

It's hard, it's really hard.

"Hey, who came up with this question? Isn't this a deliberate scolding?"

Qin Luo saw through everything at a glance, without too much hesitation, he just picked up the pen and started working!

Let the equation of AB be: y=k(x-1)+2, bring into the hyperbolic equation...

...So the value range of z is (-1,0)U(0,+∞).

Qin Luo hurriedly wrote down the problem-solving process. Until now, he only spent 3 minutes.

"Get 10 points." Qin Luo let out a long sigh of relief, burning a lot of brain cells to death.

After checking the accuracy, Qin Luo looked up and looked around.

A boy on the left is trembling all over, while a girl on the right is biting the barrel of a pen and sweating profusely... As far as Qin Luo's eyes can see, no one is writing.

"..." Is it really that difficult? Qin Luo doesn't think so.

Suddenly, Qin Luo's eyes narrowed, and he saw Bai Chong sitting in the corner.

Unlike others, Bai Chong is working hard to write a book.

A black gel pen drew beautiful arcs in his hand, and in the next moment, the answer was already on the paper.

Well, to be able to become the top student of Chengyu No. 7 Middle School, there are really two brushes.

But Qin Luo didn't care. Bai Chong had two brushes, but he had dozens of them.

What surprised Qin Luo was that Lin Shanshan was also writing quickly.

Well, it seems that I do have the potential to be a teacher. In just a few days, I turned a scumbag into a scholar.

Suddenly, Qin Luo's eyes dimmed, and he looked up: "Hold the grass, there is someone!"

I saw a serious invigilator in a Chinese tunic suit staring at him intently.

Those hot eyes seemed to melt him in the next second.

"What to watch, hurry up and do the question." Feng Huadong said coldly.

Feng Huadong, the invigilator this time, is also the president of the Southwest Digital Federation Association.

"...Teacher, people are scary, but they are scary to death."

"Scared you? You almost scared us to death." Feng Huadong thought to himself.

Zhou conjectured that a problem that had plagued the mathematics community for more than ten years was solved by a high school student. When he heard the news, he was almost scared to death.

No one could have imagined that a student who was still in high school could prove Zhou's conjecture.

I scared you to death? Hehe...hilarious.

"Hurry up and do the question!" Li shouted, and Feng Huadong turned around and left.

"Are all the current invigilators so fierce?" Qin Luo shook his head and devoted himself to solving the problem again.

A few minutes later, Qin Luo began to write quickly again.