Shang Tian said to Lin Xiaolong and Liu Tong: "Today, I will tell you about the problem of chickens and rabbits in the same cage by the way, and you can listen carefully." Chickens and rabbits in the same cage is one of the famous interesting topics in ancient China, recorded in the "Sun Tzu Sutra". The problem of chickens and rabbits in the same cage is a common question type in the Olympiad of primary school. ”

When he was in elementary school, Shang Tian went to the Olympiad class in the orphanage, and he had a deep memory of this interesting chicken and rabbit cage, which was not a problem for him.

"Sun Tzu's Reckoning? Olympiad? Still elementary school questions? Professor Wu laughed in his heart, you make it up, continue to make it up, Lao Tzu University has been teaching for decades, reading all over the library, and I have never heard of any "Sun Tzu Sutra", I think "Lao Tzu's Sutra" is about the same.

Liu Tong and Lin Xiaolong are also in the clouds, the question of primary school, why have we never heard of it, is it Teacher Shang's strong support, the day before yesterday he did talk about some strange ways to solve the problem, but to say that this problem is a question of primary school, this is too confusing.

Lin Xiaolong persuaded in a low voice, "Teacher Shang, when is this happening, you still have the heart to teach me, time is precious!" ”

The countdown watch hand above his head had already shown that five minutes had passed, and half of the time had passed, and Shang Tian actually had a calm face and wanted to teach them.

However, Shang Tianman didn't care, and continued: "Many elementary school arithmetic application problems can be transformed into this kind of problem, or solved by using the typical solution to solve it, the "hypothesis method". Therefore, it is necessary to learn its solutions and ideas. Usually the hypothetical method is a little simpler and easier to understand. ”

Lin Xiaolong and Liu Tong were both anxious, "Teacher Shang?!" ”

Professor Wu quipped: "Hypothetical method, this is the method of solving the problem to use the unknown, even if you have a bit of eyesight, do you know the equation, the unary equation may you know, the binary equation, have you ever taught it in college?" If you are not admitted to our Liucheng University, I will tell you about it. ”

Everyone knows a few nouns in the method of solving the problem, but to really solve the problem, it is not so simple, Professor Wu is sure that Shang Tian is holding on, on the surface the clouds are light and light, maybe now he is anxiously calculating.

Shang Tian ignored him and said sternly: "You two listen carefully, don't interrupt." ”

Quite a bit of the majesty of teaching, Lin Xiaolong and Liu Tong could only be helpless, listening while worrying, if Teacher Shang was not bold, the teacher's heart was brittle, he would not have to concentrate on cultivating from scratch, how could he have the time and energy to teach us.

"Let's assume that all are chickens, then 30×2 is 60 heads, 88-60 = 28, which is equivalent to 28 more feet, this is because 1 rabbit has 4 legs, think of it as a chicken with 2 legs, each rabbit is less than 2 feet, a total of 28 feet are undercounted, and there are several 2 in 28, which is a few rabbits."

Lin Xiaolong and Liu Tong were calculating how much 28÷2 they would get, and Shang Tiankou was calculating 14 rabbits in seconds.

"Then 30-14, that's 16 chickens."

The watch needle stopped abruptly, and Shang Tian had the rusty hammer on his head, chasing the subject and hitting it one inch smaller.

"Is this all out?" Professor Wu couldn't believe that he had to use the binary equation to solve it by assuming that the chicken has x, the rabbit has y, 4x+2y=88, and x+y=30?

Why didn't this kid set up unknowns and calculate it, how can he do it in a way that elementary school students can understand, it's not scientific.

Liu Tong also figured it out, and then verified it, and sure enough, it was right, "Teacher Shang, your method is right, the final exam problem of this famous university can be solved with your method." ”

It's amazing, it's amazing.

The two of them actually followed Shang Tian, and no matter how difficult the question was, it seemed that they could find the most understandable method.

Bang, the vigorous teacher's heart feedback several qi wrapped around Shang Tian, and the second circle outside his master's heart became clearer and clearer.

After the hammer broke up the topic, it was about to attack Professor Wu.

Professor Wu's face was pale, if he was hit by this hammer, his courage and master's heart would be reduced, and today he actually capsized in the gutter and planted in the hands of this kid.

"Slow, you haven't tested me yet, I'm not losing." Professor Wu quibbled.

"Do you want to cheat? Just now you said that Mr. Shang calculated it, so you admit defeat. Lin Xiaolong was tit-for-tat, but he didn't expect this old turtle to be shameless in front of these juniors at his age.

If you want to lose, you have to convince you, Shang Tian glanced at Professor Wu, "Okay, since you want to be fair, I will give you absolute fairness, so that you can lose convincingly." ”

Shang Tian is not the heart of the Holy Mother, he wants to make Professor Wu's backlash more powerful, and his number of courage and teacher spirit will benefit the most, and the more blows he gets, the more favorable feedback he will receive.

"Old man, listen to me!" Shang Tian said solemnly, "If you can't answer this question, no matter how much you quibble, you will lose." ”

"Three people went to open a house, and each of them paid 10 yuan for a total of 30 to the boss. The boss later found out that the room was only 25 yuan, so he asked the waiter to refund 5 yuan to them. The service yuan was greedy and cheap, so he collected 2 yuan and gave them three yuan, just one person to share a piece. In other words, they each paid 9 yuan. 3×9=27, plus the 2 yuan taken by the waiter, it is 29. Ask you, where is the other dollar? ”

Play brain teasers for me, I don't know that I played with my classmates every day in elementary school, and after the question, Shang Tian looked at Professor Wu.

I saw him picking his head, looking confused.

"Give you 20 minutes." Shang Tian said with disdain.

The longer the time is given, Professor Wu can't figure it out, and the more powerful his backlash will be.

Shang Tian sat on the podium, reviewing the problem of chickens and rabbits in the same cage with Lin Xiaolong and Liu Tong just now, consolidating their learning, and did not take Professor Wu in his eyes at all.

This question has stumped countless teenagers, and Professor Wu, who is sure of this world, must be confused.

The second hand turned little by little, and Professor Wu listened to it like a life-urging clock, grabbing a little hair on the top of his head, feeling that he was going to become bald when he exerted his strength.

Professor Wu, who couldn't figure it out and couldn't figure it out, actually came to a bold inference when he was only a few minutes, "This is a wrong question, haha......"

He roared, "With my years of math accumulation, this is definitely a mistake, and you probably can't tell where the money went, haha." ”

Liu Tong also thought about the question just now, and said to Shang Tian: "Teacher, I also think that this is a wrong question, and there is no solution at all. ”

Shang Tian stood up and smiled faintly, "Yes, this is a wrong question, but I just tested what you said about his mistake?" ”

Professor Wu was stunned, Nima, I have been calculating for a long time, this is clearly a trap, the teacher duel is not only to solve the problem, but also to have the eye to distinguish between right and wrong questions.

"You're cheating on me and wasting a lot of time on your mistakes."

"It's just a trick on you, what's wrong?" Shang Tian deliberately provoked.

Lin Xiaolong and Liu Tong looked at Shang Tian in confusion, "Is there anything else like this?" ”

Click.

I saw that the second hand was about to run out.