Super Xueba: Start With A Low Control Score!

Chapter 51: A real ruthless person, who doesn’t even use scratch paper, can he see it at a glance?

“?”

“???”

“How… how is it possible?”

“Am I dazzled, or am I dreaming?”

As a veteran mathematics teacher, Cao Tianyuan has always been famous for being an old man, but now he is stunned.

Just because…

Jiang Nan has actually finished two-thirds of the paper, leaving only the last three major questions?

How can this be?

He knows that Jiang Nan is very good, and he thinks that although this paper is difficult, it is not enough to stump Jiang Nan.

But the problem is…

No matter how good you are.

It’s impossible to do it so fast!

To know……

It’s not ten minutes before the test begins!

It’s incredible.

Cao Tianyuan pushed the black-rimmed glasses on the bridge of his nose while his brain thinking was running wildly. He wanted to see if Jiang Nan did it so quickly, whether he really did it right.

Then……

The first question is correct.

The second question is correct.

The third question is still correct.

As for the following multiple-choice questions and fill-in-the-blank questions.

Honestly.

With no pen and paper in his hands, Cao Tianyuan would really be unable to do it for a while only by mental arithmetic.

to this end.

He left it aside.

Look directly at the solution problem behind.

“1: Given the quadratic function f(x)=ax^2+bx+cx, the solution set of the inequality f(x)>-2x is (1, 3).

(1) If the equation f(x)+6a=0 has two equal real roots, find the analytical formula of f(x).

(2) If the maximum value of f(x) is a positive number, find the value range of the real number a. ”

The answer written by Jiang Nan is…

untie……

Because the solution set of the inequality f(x)>-2x is (1, 3).

So x=1 and x=3 are the two roots of the equation ax^2+(b+2)x+c=0 (a is less than 0).

Also because (b+2)/a=-4.

c/a=3.

So b=-4a-2 and c=Зa.

And the equation f(x)+6a=0 has two equal real roots.

so……

…

f(x)=-1/5x^2-6/5x-3/5.

…

(2): From 1 we can see that f(x)=ax^2-2(2a+1)x+3a=(-a^2-4a-1)/a.

…

Because a is less than 0.

So the maximum value of f(x) is (-a^2-4a-1)/a.

…

Obtained: The value range of the real number a is (-∞,-2-√3)U(-2+√3,0).

…

this……

this……

this……

How to describe it?

The cause and effect are meticulous and not at all muddle-headed.

After watching the problem-solving process.

Cao Tianyuan was completely dumbfounded.

He can be sure…

Jiang Nan got this question 100% correct.

To know……

This question is not easy!

It is no less than the finale of the college entrance examination.

But for Jiang Nan, it’s as simple as chopping melons and vegetables. It doesn’t seem to need to think through the brain?

This is simply…

“Fuck!”

Only these two words appeared in Cao Tianyuan’s heart.

He thought he knew Jiang Nan very well, but now he knows that he doesn’t know Jiang Nan at all.

Although he said it before.

Jiang Nan may be able to win the National One in the Olympic Games, but that is more or less inspiring to Jiang Nan.

But now…

He really believes that Jiang Nan can take the country one.

This son.

It’s a monster!

Cao Tianyuan can’t think of other words to describe Jiang Nan’s mathematical talent, only evildoers.

At the same time.

When another invigilator was visiting the examination room, he found Cao Tianyuan standing motionless behind Jiang Nan, and walked over curiously, “Teacher Cao, what’s the matter?”

“Why are you staring at this student?”

“Could it be…”

“Do you suspect him cheating in the exam?”

“…”

“Cheating?”

“How could he cheat?”

“I’m admiring and learning. This kid’s problem-solving ideas and problem-solving speed are enough to make people astounded.”

“…”

“Oh?”

“Is it?”

“He is so good?”

“How can you get the evaluation of Teacher Cao?”

Hearing what Cao Tianyuan said, the invigilator was quite unbelievable, and craned his neck to look at Jiang Nan’s test paper.

but……

Next second!

“this……”

“this……”

“How can this be?”

“It’s just been a while since the exam. Others didn’t even finish the multiple-choice questions, but he did the last two questions?”

The invigilator was also stunned.

It was similar to Cao Tianyuan’s mental state just now.

“he……”

“Did you get it right?”

“Isn’t it a mess?”

He was surprised by Jiang Nan’s answering speed, but he had doubts about the accuracy of Jiang Nan’s answering questions.

certainly!

He is not a math teacher.

Like Cao Tianyuan, he couldn’t understand it instantly.

but……

Cao Tianyuan nodded his head vigorously, “It’s not a random writing, but it’s all correct. The accuracy is 100%.”

Wow!

As soon as this remark came out.

The invigilator immediately widened his eyes and took a breath. If it weren’t for the examination room and the need to maintain discipline, he couldn’t help but jump up.

Shout out.

“Fuck!”

He can doubt Jiang Nan.

But he would not doubt Cao Tianyuan.

After all, Cao Tianyuan is the deputy head of the school’s mathematics group, a senior master, and the kind of super-high level of mathematics.

Cao Tianyuan said that Jiang Nan did everything right.

Then Jiang Nan must have done it right.

That’s why.

He would be so surprised.

Within ten minutes of the test, Jiang Nan had almost finished the entire math paper, and it was 100% correct.

What is this concept?

Straight A student?

Super schoolmaster?

Do not!

This can’t be used to describe Jiang Nan at all. Okay!

At the very least, it is also a study of God, super study of God.

and……

He also noticed one thing.

That is……

Jiang Nan actually answered the question directly on the answer sheet. The test paper and the draft paper are all blank?

even……

After Jiang Nan finished the penultimate problem, it only took a few seconds to read the final finale, and then he took the pen to solve it directly on the answer sheet.

“this……”

The proctor’s jaw almost fell to the ground.

Stupefied, stupid, dumbfounded.

“classmate!”

“What the hell are you?”

“Are you sure you are taking the math test?”

“Didn’t it mean that the finale of mathematics is difficult? But you can see it at a glance?”

“You don’t even use draft paper, and you don’t need to calculate it in advance. Are you too cruel?”

“You obviously didn’t put mathematics in your eyes! You didn’t put the teacher in the paper group into your eyes!”

“You really are #￥%@￥%!!!”

“…”