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

No confusion at all!

It was not affected at all!

But Xu Yuehai and Wei Xiaojiao went to Xu Zongyun's room and didn't find Xu Zongyun's person, they were very surprised.

"where it goes?"

"Where is the person? The mobile phone is still in the room!"

Yue Pingting came down at this time, "Uncle, aunt, Xu Zongyun is studying with Xu Heng in the e-sports room."

In the gaming room?

Studying with Xu Heng?

Who believes it!

Xu Yuehai's face turned red at that time, "This kid! You don't learn well! It's too much!"

"It's getting bigger and bigger!"

"Who does he think he is! Can he compare with Xu Heng?!"

Xu Yuehai wanted to hit someone. Looking around, there was a book. He rolled up the book and rushed up.

Wei Xiaojiao followed closely behind.

Yue Pingting, "Um...?"

Why such a big reaction!

Yue Pingting was stunned for a few seconds before she realized that the place she said was wrong!

Misunderstood!

She also caught up, "Wait! Uncle and aunt, it's not what you think! Don't be impulsive!"

Xu Yuehai, "There are so many rooms at home! There is also a study room! Can't you study him? This Xu Zongyun, why does he have to go to the e-sports room to study?! See if I don't teach this brat a lesson!" Four.

Chapter 247

"Xu Zongyun! Xu Zongyun! Come out to me!"

"Let me tell you! You are you, and your brother is your brother! You play games every day, and that's something you can do! Don't be ashamed, you boy!"

Xu Yuehai rushed all the way to the gaming room!

Suddenly!

The moment he opened the door.

He's dumbfounded—

Because Xu Hengzheng was playing games while speaking to Xu Zongyun.

Xu Yuehai's jaw was wide open, and he didn't know what to say for a while.

Xu Heng happened to end the game at this time, and turned to look at Xu Yuehai.

"What's the matter, uncle?"

Xu Yuehai, "I... I... wait! Is it true that you kid is not playing games, or is it fake?"

run over here!

Xu Yuehai tried all the computer hosts except the one Xu Heng was playing with.

cold!

and so--

Xu Zongyun didn't play games at all, he was wronged!

"Yes, yes, but why do you study in the e-sports room? Can't you learn after school? Or can't study you in the room?"

Xu Yuehai stared at Xu Zongyun.

Xu Zongyun was confused, he shrugged his shoulders with a look of helplessness.

"???"

Wei Xiaojiao also came over, with a dazed expression on her face, "What's going on?"

Yue Pingting also chased after her, "Uncle and aunt! I just said that Xu Zongyun is studying with Xu Heng."

Xu Heng understood.

"Second Uncle! Are you afraid that he will play games with me?"

"No! I'm just playing a game!"

Xu Zongyun curled his lips, "Yeah! Dad! The reason why I came here is because I want to ask my brother a question! Oops! You ran in suddenly, we lost our train of thought!"

Xu Yuehai, "I...!"

He was wronged!

He was speechless.

"*%￥# @￥￥..."

Xu Heng and Xu Zongyun looked at Xu Yuehai together, "So, is there anything else?"

never mind!

What else can happen!

Xu Yuehai smiled, "Go on! Go on!"

Xu Yueshan and Zhou Xiu'e were also taken aback and ran up.

Xu Yuehai, "Don't bother you! Go on! Go on!"

He even closed the door for them himself!

Later--

Xu Yuehai looked at Xu Yueshan and Zhou Xiu'e in disbelief, "Brother! Sister-in-law! What's going on!"

Xu Yueshan and Zhou Xiu'e were also confused, "We should ask you what's going on?"

Xu Yuehai gasped.

In a very shameless situation, he was even more shocked.

"Xu Heng can do two things at once! He is playing excellent and giving lectures to our family Zongyun at the same time!"

Xu Yueshan, "!!!"

Zhou Xiu'e, "!!!"

This is the first time they know.

Swish!

Suddenly, the eyes of the four adults focused on Yue Pingting.

Yue Pingting immediately explained, "It happened again before, even when Xu Heng was translating classical Chinese for our Chinese teacher!"

"Hiss... Even the Chinese teacher came to ask Xu Heng?"

Yue Pingting was stunned for a moment, something is wrong waiting!

It is secondary for the Chinese teacher to ask Xu Heng for advice!

The main thing isn't that Xu Heng has long been able to do two things at once?

???

Xu Yuehai waved his hands in embarrassment, his old face flushed, "I was careless! Let's go! Cough cough cough..."

Xu Yueshan rolled his eyes, "I'm not talking about you, you have no confidence in Xu Zongyun! He is obviously very self-conscious, but you are the ones who were surprised."

Xu Yuehai sighed, "Hey... big brother! Not everyone is like Xu Heng!"

Xu Yueshan and Zhou Xiu'e frowned, and said very seriously, "It shouldn't be! What's special about Xu Heng in our family! It's very ordinary!"

puff-

Brother!Sister-in-law!

Please be yourself!

Is Xu Heng in your family normal?

Xu Yuehai was extremely depressed.

"Pingting! My uncle and aunt have a task for you. You can go up later and supervise Xu Zongyun for us, okay?"

After Yue Pingting got to the top, she directly told the story.

Xu Zongyun sighed, "Hey! My parents are still worried about me!"

Seeing Yue Pingting coming, Xu Heng heaved a sigh of relief.

"Look at the topics he doesn't know, and tell him about them! If you don't know any more, ask me again!"

Yue Pingting, "Can I do it?"

Xu Heng, "What's wrong with you? You've already learned beyond the outline! Everything in high school is no problem for you, okay? Yue Pingting, don't underestimate yourself, girl."

Yue Pingting stood behind Xu Heng, with a pair of jade hands in front of Xu Heng.

When Xu Heng raised his hand, he just caught Yue Pingting's lovely face.

Yue Pingting reluctantly agreed, "Okay! Show me the title?"

Although Yue Pingting wanted to read the questions, she was always standing behind Xu Heng, and they were always side by side.

Xu Zongyun handed over the topic.

topic:

According to a scholar's theory, assuming that a person produces a product with a unit cost of a yuan, if he sells the product at a unit price of m yuan, his satisfaction is m/(m+a); if he buys the product The unit price of the product is n yuan, and his satisfaction is n+a.If a person's satisfaction with two transactions (sell or buy) is h3 and h4 respectively, then his combined satisfaction with these two transactions is under the square root (h3h4).

Now suppose that the unit cost of producing A and B is 12 yuan and 5 yuan respectively, and the unit cost of B producing A and B is 3 yuan and 20 yuan respectively. Let the unit prices of products A and B be respectively is mA and mB, the comprehensive satisfaction of A buying A and selling B is hA, and the comprehensive satisfaction of B selling A and buying B is hB.

(1) Find the expressions of hA and hB with respect to mA and mB; when mA=(3/5)mB, prove that hA=hB;

(2) Assuming mA=(3/5)mB, when mA and mB are respectively, the overall satisfaction of both A and B is the largest?What is the maximum overall satisfaction?

(3) Note that the maximum overall satisfaction in (2) is h0. Can the values ​​of mA and mB be properly selected so that hA≥h0 and hB≥h0 are simultaneously established, but the equal signs are not simultaneously established?Try to explain why.

This is a math problem with a lot of words!

Under normal circumstances, it is the finale math problem, and there will not be so many words.

It stands to reason that after Yue Pingting finished reading the questions, she would immediately fall into deep thought and then think seriously.

After all, not everyone can be as dual-purpose as Xu Heng.

but--

Yue Pingting spoke directly, "First question, you just need to express the satisfaction of A and B, sort out the simplest form, and express the equality you want to prove under the condition mA=(3/5)mB Two formulas are enough!"

"Then, after expressing the results, sort out the form of the basic inequality about the variables, and use the basic inequality to find the result when the satisfaction of the two people is the highest..."

"After the first two questions are solved, you can know that h0=2/3, because hA and hB≤4/9, the values ​​of mA and mB cannot be obtained, so that hA≥h0 and hB≥h0 hold at the same time... "

"..."

"The idea is given to you, you go think about it."

Xu Zongyun was dumbfounded.

He never expected that Yue Pingting would give him a lecture like this!

Yue Pingting looked at Xu Zongyun who was stunned, "???"

"Wake up! Do you understand?"

Xu Zongyun, "Probably...should...maybe...right!"

"Um... Sister-in-law, I have a question for you. With your strength, you are only the top three in your class. How good are No.1 and No.2... No, No.1 is my brother... ...Then No.2... Or, the level of high school in your school is too scary!"