Super Xueba: Start With A Low Control Score!

Chapter 88 Don’t use paper and pen, just count and answer in seconds?

“hiss……”

In an instant, the people present took a breath.

Especially Zhou Lingfeng, the leader of the math group, was so startled that he covered his chest with his hands, and was almost sent straight away.

f*ck!

The real competition question he worked out with painstaking effort.

But Jiang Nan said it was simple, saying that he knew the answer at a glance, there was no need to do it at all?

Gee!

This tone is not mad.

Let’s not talk about Jiang Nan’s true level.

Just talk about the ability to speak big.

In his decades of teaching career, Jiang Nan is definitely the strongest one he has encountered.

Originally, he still attached great importance to Jiang Nan.

after all……

In this monthly test, Jiang Nan got a perfect score in mathematics and defeated the super student Qin Feng, who has always occupied the top spot in the school.

and……

There is also a strong recommendation from the deputy team leader Cao Tianyuan.

but……

Hear what Jiang Nan said.

He suddenly felt a little disliked with Jiang Nan.

“Well, well, you said these questions are simple, and you can see them at a glance, then what do you say is the answer to this question?”

Zhou Lingfeng pointed to the first multiple-choice question and asked.

The minimum value of the distance from the whole point on the plane (the point where the vertical and horizontal coordinates are integers) to the straight line y=5/3x+4/5 is…

A: √34/170.

B: √34/85.

C: 1/20.

D: 1/30.

This is the minimum distance from a point to a straight line.

It’s not difficult at first glance.

but……

That’s just at first glance.

If you really want to get the answer.

It is absolutely impossible to not consume half a draft paper.

However……

Jiang Nan neither took the paper nor the pen, just glanced at it, and said directly: “Answer B.”

“hiss……”

Zhou Lingfeng inhaled again.

Just because…

correct.

Is Jiang Nan’s answer right?

“You… have you done this before?”

Zhou Lingfeng’s eyes widened, unable to believe it.

“No.”

Jiang Nan shook his head directly.

“Then why are you so fast?”

“Didn’t I just say it? This question is very simple, you can know the answer at a glance, there is no need to do it.”

“you……”

Zhou Lingfeng almost vomited with blood, “You’re not fooling a coincidence! Tell me about the process?”

“…”

“Set the coordinates of the whole point (m, n), then the distance from it to the straight 25x-15y+12=0 is d=|25m-15n+12|/√(25^2+(-15)^2)= |5(5m-3n)+12|/5√34.”

“Because of m, nEZ, 5(5m-3n) is a multiple of 5. Only when m=n=-1, the absolute value of 5(5m-3n)=-10 and 12 is the smallest, and its value is 2. ”

“So the minimum value sought is √34/85.”

“The answer is B.”

“…”

“this……”

Zhou Lingfeng was stunned again.

The question was given by him.

Naturally, I have read the answer beforehand, including the problem-solving process.

so……

He can be sure.

Jiang Nan’s process is right.

Is it 100% correct, but a lot more streamlined?

Fighting Qi transforms horses, terrifying.

Not only him, but the leaders of the physics, chemistry and biology groups next to him were also stunned.

Also Cao Tianyuan, Xie Hongwei and Hu Yifei are fairly calm, after all, they have some understanding of Jiang Nan.

Especially Xie Hongwei, a physics teacher, although he was trying to figure out Jiang Nan’s mathematics, he was amused.

Just because…

He couldn’t be more familiar with this scene.

He had also given Jiang Nan questions in class before.

And it’s all harder.

The kind that ordinary students simply can’t do.

But Jiang Nan didn’t even need a calculation. As soon as his question came out, Jiang Nan stood in his seat and answered it in seconds.

The old picture reappears.

But the person who was beaten in the face was changed.

As a bystander.

Xie Hongwei almost couldn’t hold back a laugh.

As for Cao Tianyuan, the solemn expression on his face had long since disappeared, but a trace of pride flashed through uncontrollably.

He secretly glanced at Zhou Lingfeng, “Hehe, do you think I don’t know your tricks to write the question?”

“It’s just that I don’t care.”

“after all……”

“In the face of absolute strength, no matter how many of your little tricks are paper tigers, they will be broken in one blow.”

“…”

“impossible!”

“It’s absolutely impossible.”

“These are all Mathematical Olympiad questions, how could it be possible to calculate the answer directly without even thinking about it?”

Zhou Lingfeng still couldn’t believe it, and pointed to the second question to Jiang Nan: “Which one do you think you choose for this question?”

“C, 3√3.”

“What about the third way?

“C, 3^999.”

“How about the fourth way?”

“A, two roses are expensive.”

“The last finale?”

“D, lg|sinx|.”

“…”

Zhou Lingfeng: “…”

Teacher present: “…”

Everyone is dumbfounded.

No paper or pen is needed, it’s just a matter of seconds.

This is not the point…

The point is that from Zhou Lingfeng’s reaction, we can know that Jiang Nan answered all these questions correctly?

Zhou Lingfeng felt that he was going crazy.

Is it a dream?

but……

He pinched himself.

f*ck!

It hurts so much!

This is not a dream at all!

Can……

Not dreaming.

Is there such a genius in the world?

Or……

Jiang Nan is cheating?

Zhou Lingfeng turned his head and looked at Cao Tianyuan: “Old Cao, tell me honestly that you didn’t show this paper to Jiang Nan in advance and gave him the answer, so he knew?”

“Lao Zhou, are you stupid?”

Cao Tianyuan cursed without annoyance, “You made this paper temporarily. It is like a baby bump. You haven’t shown this copy to me. How can I show it to Jiang Nan?”

“Also…right!”

Zhou Lingfeng nodded.

indeed……

He knew this paper alone.

How could Cao Tianyuan have it?

“Then…you have been giving him special training? You have done the competition questions for him for nearly 20 years?”

Cao Tianyuan: “…”

Directly speechless.

It would be great if he had given Jiang Nan special training.

But the problem is…

Jiang Nan doesn’t even listen to him in class, how can there be special training?

“Jiang Nan, you can give our team leader Zhou a detailed explanation of the problem solving process! lest he doubt this or that.”

Cao Tianyuan kicked the ball directly to Jiang Nan.

Jiang Nan nodded and pointed to the second question: “From the figure, we can see that if BD=t, then OD=√3t-1, so B(√3t-1, t) satisfies the equation x^2-y^2= 1. You can get =√3, so the area of ​​an equilateral triangle, △ABC is 3√3.”

One question just ended.

Jiang Nan pointed to the next question again.

“This question requires the expansion to reduce the sum of two coefficients in each interval, which can be associated with the unit root of 1, using the special value method…a0+a3+a1998=3^999, so choose C.”

“…”

“This last question is even simpler.”

“Use the method of elimination directly.”

“Y=sin|x| is not a periodic function, just make a graph to know, you can exclude option A.”

“The minimum positive period of y=cos|x| is 2π, and it is a decreasing function on (0,,π/2), excluding B.”

“Y=|ctgx| is a decreasing function on (0, π/2), excluding C, in the end there is only D, lg|sinx|.”

“…”

“Seven three twenty nine!”

“Eight Eighty Eight!”

“Seven two!”