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

Playing straw paper, I used one sheet after another.

After the multiple-choice questions, there are fill-in-the-blank questions, and after the fill-in-the-blank questions are answer questions.

However, coincidentally.

When Luo Dachuan went down to the big question, Xu Heng just woke up.

Going downstairs, I saw Xu Zongyun and a stranger in the living room.

Following Xu Heng was Yue Pingting. When she saw Luo Dachuan, she froze for a moment, "Aren't you a student? It's really surprising..."

Luo Dachuan raised his head at this time and was very excited when he saw Xu Heng.

After waiting for so long, he finally met Xu Heng!

"Hello Xu Heng!"

He hurriedly got up, stepped forward to say hello, pushed his glasses habitually, and reached out to shake hands with Xu Heng.

Xu Heng didn't hesitate, and the two shook hands.

Luo Dachuan was a rainbow fart when he came up, "I didn't expect Xu Heng to be so handsome! His girlfriend is also so beautiful! What a talent and beauty!"

Xu Heng, "Thank you."

Xu Zongyun also got up and walked over at this time, rolled his eyes at Luo Dachuan, "I've never seen you praise me so much!"

Luo Dachuan, "Eh...!"

In order to get close to Xu Heng, he immediately looked for a breakthrough, picked up his test paper, and came to Xu Heng, "Brother Xu Heng, I want to ask you a question! This question..."

The purpose of asking the last question in the test paper is to worry about Xu Zongyun's meeting.

After all, the finale is at the end!

But he never expected that Xu Zongyun volunteered directly after these words were uttered.

"Damn! Why don't you know this question?! I'll teach you! I can answer this question! Come on, let me tell you about this question first."

Luo Dachuan, "Pfft..."

You are going to die...! ! !

I am Nima!

I finally waited until Xu Heng woke up, finally found the opportunity to chat with Xu Heng, but you forcibly deprived me of it!

What is this called?

God closed the door for me, and he also sealed the windows for me!

I thank you!Xu Zongyun!

Luo Dachuan looked at Xu Zongyun helplessly.

Xu Zongyun grinned, "You're welcome."

you are welcome?

No need to thank your sister!

Luo Dachuan, "%￥####%￥..."

Didn't you say that this set of questions is difficult?

Xu Zongyun, are you sure you will!

what! ! ! ——

Luo Dachuan's heart was already standing on the vast grassland, facing one side, let out a helpless and broken roar.

Xu Zongyun, "Hey! Don't get lost! Let's look at the questions!"

Luo Dachuan had a look of lovelessness.

Known function f(x)=|2x-1|+|x+1|

(1) Solve the inequality f(x)≤3;

（2）记函数g（x）=F（x）+|x+1|的值域为M，若t∈M，试证明：t2-2t≥3。

Xu Zongyun, "This question is simple. Let's look at the first question first. Combined with the analytic zero-point segmentation of the function, the solution set of the inequality f(x)≤3 can be obtained as {x|-1≤x≤1}."

"Simple, right?"

"Then let's look at the second question."

While talking, Xu Zongyun wrote.

由题意可得，g（x）=f（x）+|x+1|=|2x-1|+|2x+2|≥|2x-1-2x-2|=3

if and only if...

.......

Chapter 268

It was really said by Xu Zongyun.

Luo Dachuan, "%￥###@￥￥......"

He's all bad.

He was really surprised. Why did Xu Zongyun find it easy when many people in the group found it difficult?

???

Didn't he even fail the selection for the Olympiad?

And it's the domestic one!

This time, why did he think this set of test papers was easy?

shouldn't be...

He even chose the finale!

!!!

He's all bad.

Luo Dachuan was in a trance...

Xu Zongyun, "???"

"Do you understand? This additional question is indeed a bit confusing, but..."

and many more!

Additional questions?

suddenly!

Luo Dachuan just came back to his senses, he just chose the wrong question!

This is an additional question!

Not the finale!

puff-

Luo Dachuan curled his lips, and then he came back to his senses and read the question seriously.

amount……

He can do this question too!

He didn't pay attention to the review!

Hastily!

Xu Zongyun still asked in his ear, "How is it? Do you understand?"

Luo Dachuan slapped his head, "Wait! Wait! It's not this question, I misread it, it's this one, this one!"

"Master Xu Heng..."

That's only half the story!

Xu Zongyun tilted his head to look at the question Luo Dachuan pointed to.

"Damn! Don't ask him! I can do this question too!"

will also...

???

puff-

Luo Dachuan was completely overwhelmed!

He looked down at the question, he really couldn't, this time he was right!

It's true!

已知函数f（x）=lnx-2x2+3，g（x）=f（x）+4x+alnx（a≠0）。

(1) Find the monotone interval of the function f(x);

(2) If the equation g(x)=a about x has a real number root, find the value range of the real number a.

and many more!

Sack of balls!

This question not only involves reciprocals, but also logarithms!

You, Xu Zongyun, are only a sophomore in high school, do you understand?Can you understand this?

Luo Dachuan's eyes widened, the eyeballs were about to pop out!

He always felt that Xu Zongyun was talking big!

"Xu Zongyun, are you sure you know these 18 questions?"

Xu Zongyun smiled. Although he smiled naturally, in Luo Dachuan's eyes, his smile always gave people a bad feeling.

Xu Zongyun, "My brother has taught me a lot these days! I understand everything!"

Very lightly said!

puff-

Luo Dachuan twisted his neck and looked at Xu Heng.

This Nima!

You, Xu Heng, are too awesome!

You can't stop teaching so fast...

This guy can even do this!

!!!

Xu Zongyun, "Don't look left and right, read the questions, read the questions quickly!"

"I told you that this test is about combining functions..."

While speaking, Xu Zongyun wrote down.

Soon, the first question was solved lightly.

When it came to the second question, Xu Zongyun was basically not idle.

"This little question can use the constructor! Then the derivative function is used to study the necessary and sufficient conditions for the existence of zero points in the function."

From the meaning of the question, g(x)=f(x)+4x+alnx=(1/x)+alnx

According to the meaning of the question, the equation (1/x)+alnx-a=0 has real roots

……

So the function h(x) has a zero point