I Just Want to Be a Quiet Top Student

　　 May 15th, Friday, Nangang No. 2 High School (2) Classroom.

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

　　 Shen Qi shook his head: "Watching a movie this Sunday? I'm not free. You really pick the time, deliberately!"

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

　　 Shen Qi said slightly: "I'm really not free this Sunday. I'm going to participate in the provincial high school math league. I have already signed up."

"Well, it must focus on the Math League, next time, another day." Chen Xiaoting breathed a sigh of relief, but with some regrets: "But I only have half a day of free this Sunday. I don't know when the next time will be. Shen Qi, I really appreciate your tutoring me in math every day. I am making great progress in doing math problems. I really want to invite you to watch a movie or have a meal or something to show my gratitude."

　　 "They are all classmates, you are at the same table with me again, don't say these tacky words, which hurt feelings."

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

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

　　"..."

　　 Shen Qi and Chen Xiaoting came to an off-campus chain Chinese restaurant. The restaurant was busy and crowded during lunch time, and most of the guests were students nearby.

　　 Nangang No. 2 Middle School of course has a canteen, but the big pot of food in the canteen is unpalatable. The students either go home for lunch or take care of it outside the school.

　　 Shen Qi and Chen Xiaoting lined up to wait for the order. Chen Xiaoting stood in front of Shen Qi on his own initiative. She invited her for this lunch.

"Shen Qi, there are three sets of meals, spicy chicken thigh rice + Bawang flower keel soup, potato sirloin rice + American ginseng black chicken soup, salted fish and eggplant rice + American ginseng black chicken soup, which one do you have? I can order food on my phone. Let's pay by mobile phone together, 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 ordering information screen in the store.

　　 Chen Xiaoting was puzzled: "BUG?"

　　 The team continued to move forward, and Chen Xiaoting came to the ordering table.

　　 "Welcome to pretty girls, what can I do?" The clerk asked enthusiastically.

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

Shen Qi stepped forward to the counter and said, "Your spicy chicken thigh rice + Bawang flower 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 cups."

　　 The little brother of the clerk smiled and said, "Yes, this classmate is really good at maths. You and this pretty girl are together. What kind of package do you order? There are discounts for mobile payment.

　　 Shen Qi said: "Your menu information shows that the spicy chicken thigh rice is sold at 22 yuan, and the price of potato sirloin rice and salted fish and eggplant rice are 20 yuan and 15 yuan, respectively."

　　 The clerk still keeps a professional smile, but is a little impatient: "May I ask you to buy the main meal without the stew cup?"

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

　　 "Then what kind of package do you need?"

"Before ordering, I have to figure out a problem, namely, the unit price of the two stew cups. Although you did not announce the unit price of the stew cup, I can solve the unit price of Bawang flower keel soup and American ginseng black chicken soup through simple equations. "Shen Qi looked at the menu screen again, already calculating the result mentally.

　　 "..." The clerk stopped smiling, and said that you have something wrong with you?

　　 Chen Xiaoting is lost, Shen Qi, I invite you to lunch, don't mess up!

　　 Shen Qi said earnestly: “Here I set the unit price of Bawang Flower Dragon Bone Soup as x and the unit price of American Ginseng Black Chicken Soup as y, to get three linear equations and combine them into a linear equation system."

　　 "Through uncomplicated calculations, I got an x ​​value, that is, the unit price of Bawang Flower Dragon Bone Soup is 8 yuan, OK, there is no problem."

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

"That is to say, your American Ginseng Black-Bone Chicken Soup can be sold for either 8 yuan per cup or 10 yuan per cup. In a linear equation system, it is impossible to have two real roots of the same y. This leads to another one. The question is, is there an imaginary root 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 was speechless. He cursed in his heart. Let me tell you a MMP! If I can solve for the imaginary root, do I still need to sell fast food here?

　　 "Fuck, you are a master!"

　　 "Catch a wild learner alive!"

　　 "Which school are you from, classmate, middle school or seventh middle school? Make a friend and get a CP. Should I sweep you or you sweep me?"

　　 There were many students lining up to buy meals, and Shen Qi was immediately watched.

　　 "Puff~" Chen Xiaoting, who was still confused just now, snickered. What Shen Qi said seemed reasonable. Why can the same type of stew pot deduce two different unit prices? What is the truth? Shen Qi's observation ability is very keen, and few normal people will pay attention to this kind of detail, but Shen Qi has noticed.

　　 "Yes, why does your stew pot have two real numbers in the unit price?"

"This unscientific!"

　　 "Black shop?"

　　 "We need a reasonable explanation!"

　　 "Hello, 12315 Consumer Protection Association, there is a black shop at 233 East Eighth Street, Tianhe, I want to call the police!"

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

　　A group of students eating melon around attacked, and there was chaos in front of the ordering table.

　　 "Classmates, please calm down!"

　　 "Calm down! Reason!"

　　 "Stop making trouble with classmates, you are all literati who have read books!"

　　 The clerk brother and the clerk sisters are in a hurry, UU reads www.uukanshu. No one on com can answer Shen Qi's math problems, and all they can do is to try to comfort these little bears.

At this critical moment, the store manager stepped forward: "Our store does not have an imaginary number root, and the unit price of each type of stew cup has only one real number root! The display is wrong, and the package price information is displayed incorrectly!" The person who can be the store manager, after all, is cultural Higher degree.

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

　　 Go to Nima’s Abel group, I can’t realize that now high school students are so incapable of beating it? The store manager was unable to answer Shen Qi’s question, but he had already discovered the root cause of the confusion. In fact, the difference between their American Ginseng Black Chicken Soup was 2 yuan. All in all, they were seized by others, and it was very disturbing to think about it. What do you care about as a high school student about things that don't matter?

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

"It's barely reasonable to explain it this way." Shen Qi nodded and said to Chen Xiaoting after finishing: "Let's both order the salted fish and eggplant rice + ginseng black chicken soup combo, including the correction value and the discount value, we can save a total of 9 Yuan, which is 8.2% off. After all, I am embarrassed to ask the girl to invite me, a man, to eat.

"Well, Shen Qi, you can really do it. You moved out the real number and imaginary number root for a few dollars cheaper, and technically bargained!" Chen Xiaoting admired Shen Qi more and more, and realized the true meaning of learning mathematics to save money. Can you play 8 The fold depends on the depth of knowledge.