I Just Want to Be a Quiet Top Student

May 15th, Friday, the classroom of Class 2 (Class 2), Senior 2, Nangang No. 2 Middle School.

After the last get out of class in the morning, Chen Xiaoting said to Shen Qi in a very low voice, "Shen Qi, are you going to the movies this Sunday?"

Shen Qi shook his head: "Watching a movie this Sunday? I don't have time. You really know how to pick your time. You did it on purpose!"

Chen Xiaoting looked around like a thief, and said angrily, "Hey, can you keep your voice down?"

Shen Qi lowered his voice a little: "I really don't have time this Sunday. I'm going to participate in the province's high school mathematics league, and I've already signed up."

"That's it, then the mathematics league must be the most important thing, next time, another day." Chen Xiaoting breathed a sigh of relief, but she was a little regretful: "But I only have half a day free this Sunday, and I don't know when the next time will be. Shen Qi, I really appreciate you tutoring me in math every day, I have made great progress in doing math problems now. I really want to invite you to watch a movie or have a meal or something to show my gratitude."

"They are all classmates, and you are my deskmate. Don't say such vulgar words, it will hurt your feelings."

"Okay, I'm vulgar, I wish you a successful start and a triumphant return from the math league!"

"Chen Xiaoting, what did you just say, treat me to dinner? Then treat me to a light meal."

"..."

Shen Qi and Chen Xiaoting came to an off-campus chain Chinese restaurant. During lunch time, the restaurant was busy and full of people. Most of the customers were students from nearby.

Of course, Nangang No. 2 Middle School has a canteen, but the big pot of food in the canteen is unpalatable. The students either go home to eat their lunch or settle it outside the school.

Shen Qi and Chen Xiaoting waited in line to order food, Chen Xiaoting took the initiative to stand in front of Shen Qi, and she invited her for this lunch.

"Shen Qi, there are three sets, spicy chicken leg rice + Bawang flower keel soup, potato sirloin rice + black chicken soup with American ginseng, salted fish and eggplant rice + black chicken soup with American ginseng, which one do you want? I can order food on the mobile phone, Let's pay with the mobile phone together, which is five yuan cheaper." Chen Xiaoting asked while operating the mobile phone.

"Don't rush to order, there is a bug here." Shen Qi has been watching the order information screen in the store.

Chen Xiaoting was puzzled: "BUG?"

The team moved on, and Chen Xiaoting came to the ordering counter.

"Welcome pretty girl, what can I order?" the clerk asked enthusiastically.

Chen Xiaoting turned around and asked Shen Qi: "I want a set meal of potato and beef brisket rice + black chicken soup with American ginseng, how about you?"

Shen Qi stepped forward to the counter and said, "Your family's spicy chicken leg rice + Bawanghua keel soup set is 30 yuan, potato sirloin rice + American ginseng black chicken soup set is 28 yuan, salted fish eggplant rice + American ginseng The black chicken soup is 25 yuan, which is actually a combination of three main meals and two stew pots."

The clerk smiled and said: "That's right, this classmate is really good at mathematics. You and this beautiful girl are together, what kind of set meal can you order? There are discounts for mobile payment."

Shen Qi said unhurriedly: "Your menu information shows that the price of spicy chicken leg rice is 22 yuan per unit, and the unit price of potato beef brisket rice and salted fish and eggplant rice are 20 yuan and 15 yuan respectively."

The clerk still maintains a professional smile, but he is a little impatient: "Excuse me, do you want to buy the main meal without the stew pot?"

"No, my classmates and I come to your house for consumption, mainly for soup. Your stew pot is pretty good."

"Then what kind of package do you want?"

"Before ordering, I have to figure out a question, that is, the unit price of the two stew pots. Although you didn't announce the unit price of the stew pot, I can solve the unit price of Bawanghua Longgu Soup and American Ginseng Black Chicken Soup through simple equations .” Shen Qi looked at the menu screen again, already mentally calculating the result.

"..." The clerk stopped laughing, thinking that there is something wrong with you?

Chen Xiaoting fell into confusion, Shen Qi, let me treat you to lunch, don't make trouble!

Shen Qi said seriously: "Here, I set the unit price of Bawanghua Longgu Soup as x, and the unit price of American Ginseng and Black Chicken Soup as y, and get three first-order equations, which are combined into a first-order equation set."

"Through uncomplicated calculations, I got an x ​​value, that is, the unit price of Bawanghua keel soup is 8 yuan, OK, there is no problem."

"But it's worth noting that there are two values ​​for y, 8 and 10."

"That is to say, your American ginseng and black chicken soup can be sold for 8 yuan a cup or 10 yuan a cup. In a linear equation system, it is impossible for the same y to have two real roots. This leads to another The question is, is there an imaginary root in the unit price of your American Ginseng and Black Chicken Soup? What is the truth, please tell me, as a consumer, I have the right to know the truth.”

"I...I..." The clerk was speechless, he cursed in his heart, I tell you MMP! If I can solve the root of imaginary numbers, do I still need to sell fast food here?

"Damn it, Xueba!"

"Catch a wild Xueba alive!"

"Student, which school do you belong to, No. 2 Middle School or No. 7 Middle School? Let's make a friend and have a CP. I will sweep you or you will sweep me?"

There were a lot of students queuing up to buy meals, and Shen Qi was immediately surrounded by strong crowds.

"Pfft~" Chen Xiaoting, who was still confused just now, snickered. What Shen Qi said seemed to make sense. Why can the same kind of stewing pot be deduced with two different unit prices? What is the truth? Shen Qi's observation ability is quite keen, few normal people would deliberately pay attention to such details, but Shen Qi noticed it.

"That's right, why are there two real numbers for the unit price of your stew pot?"

"This unscientific!"

"Black shop?"

"We need a reasonable explanation!"

"Hey, 12315 Consumer Protection Association, there is a black shop at No. 233 Tianhe East Eighth Street, I want to call the police!"

"Call the police, please call the Yaoyaoling? Then please help me transfer the Yaoyaoling."

The melon-eating students around attacked him, and there was chaos in front of the ordering counter.

"Students, please calm down!"

"Calm! Reason!"

"Stop making trouble, students, you are all educated people who have studied!"

The clerk and the clerk were in a hurry, no one could answer Shen Qi's math problem, all they could do was to try their best to appease these half-grown kids.

At this critical moment, the store manager stepped forward: "There is no imaginary root in our store, and the unit price of each stew pot has only one real root! The display is wrong, and the price information of the set meal is wrong!" To a higher degree.

"Manager, actually what I want is an Abel group explanation, can you understand it?" Shen Qi likes to communicate with professionals.

Going to Nima's Abel group, I can't understand, do high school students these days deserve such a beating? The store manager couldn't answer Shen Qi's question, but he had discovered the root cause of the confusion, which was actually the difference of 2 yuan in their American Ginseng and Black Chicken Soup. All in all, it was very disturbing to think about it. What the hell are you, a high school student, worrying about?

"The unit price of all stew pots in our store is only one real number, which is 8 yuan! The price information of salted fish eggplant rice + American ginseng and black chicken soup is displayed incorrectly. It is not 25 yuan, but 23 yuan! Customers who have already purchased this set meal You can ask us to refund 2 yuan with the receipt!" The store manager responded quickly and took emergency measures immediately.

"If you explain it this way, it's barely reasonable." Shen Qi nodded, and said to Chen Xiaoting after the matter: "Let's both order the set meal with salted fish and eggplant rice + American ginseng and black chicken soup. Counting the correction value and discount value, we can save a total of 9 Yuan, that is, 12% off. It’s embarrassing to ask a girl to invite a man like me to dinner, and I can save you a little bit.”

"Okay, Shen Qi, you actually moved out real and imaginary roots for a few dollars cheaper!" Chen Xiaoting scanned the QR code with her mobile phone and bought two sets of salted fish and eggplant rice.