I just want to be a quiet scholar

Chapter 14 Real and Imaginary Roots

On Friday, May 5th, the classroom of Class 15 (2) of Nangang No. [-] Middle School.

After the last get out of class in the morning, Chen Xiaoting whispered to Shen Qi, "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 choose your time, 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 provincial high school mathematics league. I've already signed up."

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

"They're all classmates, and you're my deskmate. Don't say these cheesy words that hurt your feelings."

"Okay, I'm vulgar, I wish you a great victory and a triumphant return in the math league!"

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

"..."

Shen Qi and Chen Xiaoting came to the off-campus Chinese restaurant chain. During lunch time, the business was hot and crowded, and most of the customers were students nearby.

Of course, Nangang No. [-] Middle School has a canteen, but the large pot of rice in the canteen is unpalatable, and 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 this lunch.

"Shen Qi, there are three kinds of packages, spicy chicken leg rice + dragon bone soup, potato brisket rice + American ginseng black chicken soup, salted fish eggplant rice + American ginseng black chicken soup, which one do you want? I can order food on my phone, Let's add a mobile phone to pay, it's 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 continued to advance, and Chen Xiaoting came to the ordering table.

"Welcome to the beautiful girl, what can I do?" the clerk asked enthusiastically.

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

Shen Qi stepped forward to the counter and said, "Your family's spicy chicken leg rice + overlord flower dragon bone soup set is 30 yuan, potato brisket rice + American ginseng black chicken soup set is 28 yuan, salted fish eggplant rice + American ginseng set The black chicken soup is 25 yuan, which is actually a combination of three main meals and two stews.”

The clerk smiled and said, "Yes, this classmate is really good at mathematics. You and this pretty girl are together, right? Which package do you want? There are discounts for mobile payment."

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

The clerk still kept a professional smile, but he was a little impatient: "Do you want to buy the main meal alone without the stew?"

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

"Then what kind of package do you need?"

"Before ordering, I have to figure out a question, that is, the unit price of the two kinds of stewing pots. Although you have not announced the unit price of the stewing pots, I can solve the unit price of the dragon bone soup with dragon bones and American ginseng black chicken soup through a simple equation system. ." Shen Qi looked at the menu screen again, and had already calculated the result.

"..." The clerk didn't smile anymore, thinking what's wrong with you?
Chen Xiaoting is confused, Shen Qi, I invite you to lunch, don't do anything!

Shen Qi said seriously: "Here I set the unit price of Bawang Hualong Bone Soup as x, and set the unit price of American Ginseng Black Chicken Soup as y, and get three linear equations, which are combined into a system of linear equations."

"Through uncomplicated calculations, I got an x ​​value, that is, the unit price of Bawanghua Dragon Bone 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 family's American ginseng black chicken soup can be sold for 8 yuan a cup and 10 yuan a cup. In a system of linear equations, it is impossible for two real roots to appear in the same y, which leads to another The question is, is there an imaginary number in the unit price of your American ginseng 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's brother was speechless, he cursed in his heart, I'll tell you an MMP!If I can solve the imaginary root, do I still need to sell fast food here?

"Fuck you, Xueba!"

"Catch a wild scholar alive!"

"Which school are you from, classmate, No. [-] or No. [-]? Make a friend and get a CP. I'll scan you or you'll scan me?"

There were many students queuing up to buy food, and Shen Qi was instantly surrounded by strong onlookers.

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

"Yeah, why are there two real roots in 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 East Eighth Street, Tianhe, I want to call the police!"

"Call the police and call Yao Yaoling? Then please help me transfer Yao Yaoling."

The surrounding students who eat melons attacked it in groups, and the front of the ordering table was in chaos.

"Students, please calm down!"

"Calm! Reason!"

"Don't make trouble, classmates, you are all literate people who have read books!"

The clerk and the clerk were in a hurry. No one could answer Shen Qi's math problems.

At this critical moment, the store manager stepped forward: "There is no imaginary number root in our store, and the unit price of each type of stew is only one real number root! The display is wrong, and the price information of the set menu is displayed incorrectly!" People who can be store managers, after all, cultural To a higher degree.

"Store manager, in fact, what I want is an Abel group explanation, can you understand it?" Shen Qi likes to communicate with professionals.

Going to the Abel group of Nima, I can't understand, are the current high school students so bad?The store manager couldn't answer Shen Qi's question, but he had already discovered the source of the confusion. In fact, it was the difference of 2 yuan in their American ginseng black chicken soup. All in all, they were caught by others, and it was annoying to think about it. I don't care what you are a high school student to worry about?

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

"If you explain it like this, it's barely reasonable." Shen Qi nodded and said to Chen Xiaoting, "Let's both order the set meal with salted fish eggplant rice + American ginseng black chicken soup. Including the correction value and discount value, we can save a total of 9 Yuan, that is, 8.2% off. I'm sorry to ask my sister to invite this man to dinner, so I can save you a little bit."

"Okay, in order to save a few dollars, you actually moved out the real number and the imaginary number. Shen Qi, you really fight!" Chen Xiaoting scanned the code with her mobile phone and bought two sets of salted fish and eggplant rice.

(End of this chapter)